Chemical Safety and Storage Practices
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Questions and Answers

What should be done with items contaminated with hazardous materials before removal from the hood?

  • They can be removed without any precautions.
  • They should be left in the hood indefinitely.
  • They should be decontaminated or placed in a closed container. (correct)
  • They should be destroyed immediately.

Which chemical should not be stored with ammonia solution?

  • Acetic acid solution. (correct)
  • Cyclohexane solution.
  • 2-Propanol solution.
  • Sodium hydroxide solution.

What is the primary consideration when storing chemicals?

  • Frequency of usage
  • Cost of the chemicals
  • Compatibility with other chemicals (correct)
  • Size of the container

Which of the following chemicals is classified as an oxidizer?

<p>Potassium dichromate (A)</p> Signup and view all the answers

What should be avoided while operating a UV-Vis spectrophotometer?

<p>Keeping the sample compartment open during use. (A)</p> Signup and view all the answers

Which of the following equipment does NOT require annual third-party calibration?

<p>Sets of weights (C)</p> Signup and view all the answers

In starting up laboratory operations, which should be done first?

<p>Turning on the hoods, vents, and exhaust fans. (C)</p> Signup and view all the answers

What action should be taken before turning on the UV-Vis spectrophotometer?

<p>Check if the sample holder is empty. (D)</p> Signup and view all the answers

What pH level qualifies waste as ‘alkali waste’?

<p>pH &gt; 12.5 (C)</p> Signup and view all the answers

Which of these describes a person who produces hazardous wastes?

<p>Waste generator (A)</p> Signup and view all the answers

Which hazardous waste characteristic applies to aqueous solutions with a pH less than or equal to 2 or greater than or equal to 12.5?

<p>Corrosivity (C)</p> Signup and view all the answers

What defines ignitability in hazardous waste?

<p>Flash point less than 140°F (A)</p> Signup and view all the answers

What best describes residual wastes?

<p>Material that can no longer be beneficially reused (D)</p> Signup and view all the answers

Which waste materials are classified as hazardous due to their ability to puncture skin?

<p>Hazardous glass and plastics (A)</p> Signup and view all the answers

What is the definition of reactivity in the context of hazardous waste?

<p>Generation of toxic fumes upon interaction with water (A)</p> Signup and view all the answers

What characteristic of hazardous waste applies to any material that is unstable or has explosive potential?

<p>Reactivity (A)</p> Signup and view all the answers

Which hazardous waste characteristic indicates the potential to contaminate groundwater if improperly disposed of?

<p>Toxicity (A)</p> Signup and view all the answers

What is the term for organic chemicals that resist environmental degradation?

<p>Persistent Organic Chemicals (POPs) (D)</p> Signup and view all the answers

Which method is recognized as a solid waste management practice that breaks down organic matter?

<p>Composting (A)</p> Signup and view all the answers

What is the term used for liquid that has extracted dissolved and suspended matter from a landfill?

<p>Leachate (D)</p> Signup and view all the answers

What practice should be avoided when handling liquid chemicals?

<p>Carrying acid in an open container (C)</p> Signup and view all the answers

Which of the following describes a characteristic of waste that is able to ignite easily?

<p>Ignitability (C)</p> Signup and view all the answers

Which term refers to the process of cleaning up contaminated environments using biological methods?

<p>Bioremediation (B)</p> Signup and view all the answers

Which hazardous characteristic does NOT imply a material's ability to corrode?

<p>Dermatitis potential (D)</p> Signup and view all the answers

What is the correct method for using a pipette marked with 'To Deliver' (TD)?

<p>Allow a small amount of liquid to remain in the tip. (A)</p> Signup and view all the answers

Which statement about cuvette cleaning is true?

<p>Cuvettes should be cleaned in an ultrasonic cleaning bath. (A)</p> Signup and view all the answers

What must be true about opposing tubes when operating a centrifuge?

<p>They must be of equal weight. (B)</p> Signup and view all the answers

What should be avoided to ensure thorough cleaning of glassware?

<p>Leaving a uniform film of water on glassware. (B)</p> Signup and view all the answers

What is the expected concentration of potassium dichromate in Solution 2 expressed in two significant figures?

<p>3.1 mol/L (C)</p> Signup and view all the answers

Which statement about Class B volumetric glassware is correct?

<p>It does not meet ASTM standards. (A)</p> Signup and view all the answers

What is the titration reaction equation for sodium hydroxide and hydrochloric acid?

<p>NaOH(aq) + HCl(aq) ↔ NaCl(aq) + H2O(l) (A)</p> Signup and view all the answers

When reading the volume on a burette, at what position should your eye be in relation to the liquid level?

<p>Higher than the liquid level. (B)</p> Signup and view all the answers

What laboratory glassware is appropriately used to measure 25.0 mL of sodium hydroxide?

<p>Pipette (D)</p> Signup and view all the answers

How should dilutions with volumetric flasks be performed for accuracy?

<p>Dilute to the mark with distilled water. (C)</p> Signup and view all the answers

What is a common misconception regarding the cleaning of laboratory glassware?

<p>All glassware can be cleaned the same way. (B)</p> Signup and view all the answers

In Solution 5, what is the concentration of potassium dichromate expressed in two significant figures?

<p>1.2 x 10^-2 mol/L (A)</p> Signup and view all the answers

Which statement is true regarding the disposal of broken laboratory glassware?

<p>It should be collected in designated sharps containers. (C)</p> Signup and view all the answers

What is the correct approach to storing concentrated acids and bases?

<p>They should be stored separately in corrosion-resistant materials. (A)</p> Signup and view all the answers

What is the concentration of potassium dichromate in Solution 3, expressed in two significant figures?

<p>0.61 mol/L (B)</p> Signup and view all the answers

Which statement regarding fire extinguishers in laboratories is false?

<p>Fire extinguishers can be stored under chemical fume hoods. (A)</p> Signup and view all the answers

Flashcards

Decontamination or containerization of hazardous materials

Items contaminated with hazardous materials must be decontaminated or placed in a sealed container before being removed from the fume hood.

Incompatible chemical storage: Acetic acid and ammonia

Acetic acid should not be stored with ammonia solution due to the risk of a dangerous chemical reaction.

Primary chemical storage consideration

The primary consideration when storing chemicals is their compatibility with other chemicals. Incompatible chemicals can react dangerously.

Classification of Potassium Dichromate

Potassium dichromate is classified as an oxidizer, meaning it can accelerate combustion and poses fire hazards.

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UV-Vis Spectrophotometer Operation: Keeping the sample compartment closed

Leaving the sample compartment open during use can lead to inaccurate measurements and potential damage to the instrument.

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Equipment exempt from annual third-party calibration

Sets of weights are not typically subject to annual third-party calibration as their accuracy stays consistent over time.

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First step in starting laboratory operations

Turn on the hoods, vents, and exhaust fans first to ensure proper ventilation and safety before starting other lab operations.

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Safety check before using UV-Vis spectrophotometer

Before turning on the UV-Vis spectrophotometer, it's important to check if the sample holder is empty to prevent accidents and damage.

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Alkali waste pH

Alkali waste is characterized by a pH level greater than 12.5. This is a high pH level.

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Waste generator

A waste generator is a person or entity responsible for producing hazardous wastes.

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Hazardous waste: Corrosivity

Corrosivity is a hazardous waste characteristic used for materials with a pH less than or equal to 2 or greater than or equal to 12.5.

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Hazardous waste: Ignitability

Ignitability in hazardous waste is defined by a flash point less than 140°F, meaning it easily catches fire.

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Residual waste

Residual wastes are materials left over after a process that cannot be reused for their original purpose.

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Hazardous waste: Sharps

Hazardous glass and plastics are classified as hazardous due to their sharp edges, which can cause skin punctures.

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Hazardous waste: Reactivity

Reactivity in the context of hazardous waste refers to materials generating toxic fumes upon contact with water.

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Hazardous waste: Reactivity characteristic

Reactivity is a hazardous waste characteristic used for unstable materials that might explode or release dangerous substances.

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Hazardous waste: Toxicity

Toxicity is a hazardous waste characteristic indicating the potential to contaminate groundwater if improperly disposed of.

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Persistent Organic Chemicals (POPs)

Persistent Organic Chemicals (POPs) are organic chemicals that resist degradation in the environment, persisting for a long time.

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Composting

Composting is a solid waste management practice that uses biological processes to break down organic matter into a nutrient-rich compost.

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Leachate

Leachate is the liquid that collects and drains from landfills, often contaminated with dissolved and suspended matter.

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Unsafe handling of liquid chemicals: Acid in an open container

Carrying acid in an open container poses a significant risk of spills, accidents, and chemical exposure.

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Waste characteristic: Ignitability

Ignitability describes a waste's ability to ignite easily, making it dangerous if not handled properly.

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Bioremediation

Bioremediation is a process of cleaning up contaminated environments using biological methods, such as microorganisms.

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Hazardous waste characteristic: Dermatitis potential

Dermatitis potential is a hazardous characteristic related to skin irritation, but not necessarily related to corrosion.

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Pipette usage: 'To Deliver' (TD)

When using a pipette marked 'To Deliver', a small amount of liquid should remain in the tip to ensure the correct volume is delivered.

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Cuvette cleaning

Cuvettes should be cleaned in an ultrasonic cleaning bath to remove any residue and ensure accurate measurements.

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Centrifuge operation: Opposing tubes

When operating a centrifuge, opposing tubes must have equal weight to maintain balance and prevent vibration and damage.

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Thorough cleaning of glassware: Avoiding a water film

Leaving a uniform film of water on glassware hinders proper drying and can leave residual contaminants

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Potassium Dichromate concentration in Solution 2

Solution 2 has a potassium dichromate concentration of 3.1 mol/L, expressed in two significant figures.

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Characteristics of Class B volumetric glassware

Class B volumetric glassware does not meet the standards set by ASTM (American Society for Testing and Materials).

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Titration reaction equation: Sodium hydroxide and hydrochloric acid

Titration reaction equation for sodium hydroxide and hydrochloric acid is: NaOH(aq) + HCl(aq) ↔ NaCl(aq) + H2O(l)

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Burette reading: Eye position

When reading the volume on a burette, your eye should be at a higher position than the liquid level to avoid parallax error.

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Glassware for measuring precise volume: Sodium hydroxide

Pipettes are the appropriate laboratory glassware for measuring a precise volume of 25.0 mL of sodium hydroxide.

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Volumetric flask dilution

For accurate dilutions using a volumetric flask, dilute to the mark with distilled water after adding the solute.

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Misconception about glassware cleaning

A common misconception about laboratory glassware is that all glassware can be cleaned the same way, but different types require specific cleaning procedures.

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Potassium Dichromate concentration in Solution 5

The concentration of potassium dichromate in Solution 5 is 1.2 x 10^-2 mol/L, expressed in two significant figures.

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Disposal of broken laboratory glassware

Broken laboratory glassware should be collected in designated sharps containers to prevent accidents and ensure proper disposal.

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Storage of concentrated acids and bases

Concentrated acids and bases should be stored separately in corrosion-resistant materials to prevent dangerous reactions and accidents.

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Potassium Dichromate concentration in Solution 3

The concentration of potassium dichromate in Solution 3 is 0.61 mol/L, expressed in two significant figures.

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False statement about fire extinguishers in laboratories

Fire extinguishers should NOT be stored under chemical fume hoods, as they can obstruct airflow and hinder ventilation.

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Study Notes

Chemical Storage and Safety

  • Storage cabinets should be used for corrosives, oxidizers, carcinogens, and respiratory sensitizers.
  • Contaminated items must be decontaminated or placed in closed outer containers before removal from hoods.

Ammonia Solution Compatibility

  • Ammonia solution cannot be stored with acetic acid, sodium hydroxide, 2-propanol, or cyclohexane.

Chemical Storage Considerations

  • Prioritize storage based on the frequency of usage, compatibility, container size, and alphabetical order.

UV-Vis Spectrophotometer Operation

  • Check sample holder is empty before powering up, avoid keeping the sample compartment open during specific pH operations.

Waste Classification

  • Waste is considered “alkali” if pH is above 12.5.
  • Waste generation is defined by activities producing hazardous materials.

Hazardous Waste Characteristics

  • Ignitability applies to waste with flash points below 140°F.
  • Corrosivity is relevant for aqueous solutions with pH ≤ 2 or ≥ 12.5.
  • Reactivity is for materials that are unstable or explosive when mixed with water.

Solid Waste Management Practices

  • Composting aids in controlled decomposition; recycling and reducing waste are key practices.

Dilution and Concentration Calculations

  • Understanding volumes and concentrations is essential for proper chemical preparation and analysis.

True or False Statements

  • Concentrated acids and bases should be stored in corrosion-resistant materials.
  • Fire extinguishers must be accessible near chemical storage areas, contrary to safety practices.

Glassware and Measurement Techniques

  • Pipettes and burettes are fundamental for accurate measurements in titration processes.

General Laboratory Safety Guidelines

  • Always handle liquid chemicals carefully and protect against splashes with appropriate gear.
  • Never dispose of hazardous waste or broken glassware in regular trash; follow proper disposal protocols.

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Description

Test your knowledge on effective chemical storage and safety practices. This quiz covers essential topics such as compatibility of chemicals, handling hazardous waste, and operating UV-Vis spectrophotometers safely. Ensure you are well-versed in proper procedures to minimize risks in the lab.

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