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Questions and Answers
Why does washing hands with lemon juice help remove the fishy smell after cutting a raw fish?
Why does washing hands with lemon juice help remove the fishy smell after cutting a raw fish?
- The acid in the lemon juice neutralizes the alkaline substances from the fish. (correct)
- The acid in the lemon juice intensifies the fishy smell, making it more noticeable and easier to wash away.
- The alkaline substances in lemon juice react with the alkaline substances from the fish, creating a pleasant smell.
- The alkaline substances in the lemon juice counteract any acidic substances from utensils used.
Acids are characterized by having:
Acids are characterized by having:
- A pH value of exactly 7.
- A pH value that fluctuates widely.
- A pH value lower than 7. (correct)
- A pH value greater than 7.
What happens to the pH value of a solution when an acid and an alkali are mixed?
What happens to the pH value of a solution when an acid and an alkali are mixed?
- The pH value moves further away from 7.
- The pH value remains constant.
- The pH value moves closer to 7. (correct)
- The pH value fluctuates unpredictably.
What is the correct order of steps to follow when measuring change in pH value during neutralization using universal indicator?
What is the correct order of steps to follow when measuring change in pH value during neutralization using universal indicator?
What indicates that a solution has reached neutrality?
What indicates that a solution has reached neutrality?
What happens to the temperature of a solution during neutralization?
What happens to the temperature of a solution during neutralization?
What two substances are formed when an acid and an alkali neutralize each other?
What two substances are formed when an acid and an alkali neutralize each other?
What type of change is neutralization?
What type of change is neutralization?
In a word equation for neutralization, what are the reactants?
In a word equation for neutralization, what are the reactants?
In a word equation for neutralization, what are the products?
In a word equation for neutralization, what are the products?
What determines the type of salt formed during neutralization?
What determines the type of salt formed during neutralization?
What two parts make up the name of the salt formed in neutralization?
What two parts make up the name of the salt formed in neutralization?
What two substances are formed during neutralization?
What two substances are formed during neutralization?
A student mixes dilute nitric acid and dilute magnesium hydroxide solution. Which of the statements is correct?
A student mixes dilute nitric acid and dilute magnesium hydroxide solution. Which of the statements is correct?
What happens to thermal energy during neutralization?
What happens to thermal energy during neutralization?
Why is it important to properly treat chemical waste from factories?
Why is it important to properly treat chemical waste from factories?
Why is toothpaste slightly alkaline?
Why is toothpaste slightly alkaline?
Why do farmers add lime to soil?
Why do farmers add lime to soil?
Why can vinegar be used to treat wasp stings?
Why can vinegar be used to treat wasp stings?
Why can soap solution be used to treat mosquito bites?
Why can soap solution be used to treat mosquito bites?
Why does neutralization play a crucial role in treating chemical waste from factories?
Why does neutralization play a crucial role in treating chemical waste from factories?
A solution with a pH of 2 is mixed with a solution of pH 12. Which statement about the resulting mixture is most accurate?
A solution with a pH of 2 is mixed with a solution of pH 12. Which statement about the resulting mixture is most accurate?
In the context of neutralization, what distinguishes a 'salt' from the common table salt (sodium chloride)?
In the context of neutralization, what distinguishes a 'salt' from the common table salt (sodium chloride)?
If a farmer wants to increase the pH of their soil, which of the following actions would be most effective?
If a farmer wants to increase the pH of their soil, which of the following actions would be most effective?
Which statement accurately describes the role of neutralization in digestion?
Which statement accurately describes the role of neutralization in digestion?
Which of the following best describes how the pH value changes during the titration of a strong acid with a strong base?
Which of the following best describes how the pH value changes during the titration of a strong acid with a strong base?
What is the primary reason for using universal indicator in a neutralization experiment?
What is the primary reason for using universal indicator in a neutralization experiment?
If 25 cm³ of 0.1 M hydrochloric acid (HCl) is completely neutralized by 50 cm³ of sodium hydroxide (NaOH), what is the molarity of the NaOH?
If 25 cm³ of 0.1 M hydrochloric acid (HCl) is completely neutralized by 50 cm³ of sodium hydroxide (NaOH), what is the molarity of the NaOH?
During an experiment, a student finds that the temperature of a solution increases as an acid is added to a base. What does this indicate about the nature of neutralization.
During an experiment, a student finds that the temperature of a solution increases as an acid is added to a base. What does this indicate about the nature of neutralization.
What chemical process explains why applying vinegar (acetic acid) can alleviate the pain from a wasp sting?
What chemical process explains why applying vinegar (acetic acid) can alleviate the pain from a wasp sting?
Why is the mass conserved during a neutralization reaction, based on the law of conservation of mass?
Why is the mass conserved during a neutralization reaction, based on the law of conservation of mass?
In the reaction between an acid and an alkali, which of the following is NOT a typical observation?
In the reaction between an acid and an alkali, which of the following is NOT a typical observation?
Which of the following pairs of reactants will result in the formation of sodium sulfate ($Na_2SO_4$) as a product?
Which of the following pairs of reactants will result in the formation of sodium sulfate ($Na_2SO_4$) as a product?
What is the purpose of a salt bridge in an electrochemical cell involving neutralization?
What is the purpose of a salt bridge in an electrochemical cell involving neutralization?
In titrating a weak acid with a strong base, what is the significance of the half-equivalence point?
In titrating a weak acid with a strong base, what is the significance of the half-equivalence point?
What type of change is exemplified by the evaporation of water after a neutralization reaction?
What type of change is exemplified by the evaporation of water after a neutralization reaction?
When magnesium hydroxide ($Mg(OH)_2$) neutralizes hydrochloric acid (HCl), what are the products?
When magnesium hydroxide ($Mg(OH)_2$) neutralizes hydrochloric acid (HCl), what are the products?
What role does a magnetic stirrer play in experiments measuring pH change during neutralization?
What role does a magnetic stirrer play in experiments measuring pH change during neutralization?
During an acid-base titration, why is it important to use deionized or distilled water rather than tap water?
During an acid-base titration, why is it important to use deionized or distilled water rather than tap water?
If the mass of reactants in a neutralization experiment is precisely measured, but the mass of the products appears slightly less, which factor most likely accounts for the discrepancy?
If the mass of reactants in a neutralization experiment is precisely measured, but the mass of the products appears slightly less, which factor most likely accounts for the discrepancy?
Why should safety spectacles be worn during neutralization experiments?
Why should safety spectacles be worn during neutralization experiments?
Given that household ammonia has a pH of around 11 and lemon juice has a pH of around 2, predict the pH range if equal volumes of ammonia and lemon juice are mixed.
Given that household ammonia has a pH of around 11 and lemon juice has a pH of around 2, predict the pH range if equal volumes of ammonia and lemon juice are mixed.
In the context of buffer solutions, what is the significance of having both a weak acid and its conjugate base present?
In the context of buffer solutions, what is the significance of having both a weak acid and its conjugate base present?
What phenomenon explains why a volumetric flask is preferred over a beaker for preparing solutions used in precise titrations?
What phenomenon explains why a volumetric flask is preferred over a beaker for preparing solutions used in precise titrations?
What is the primary reason for performing a 'rough' titration before conducting accurate titrations?
What is the primary reason for performing a 'rough' titration before conducting accurate titrations?
What characteristic makes barium sulfate ($BaSO_4$) useful in medical imaging, despite barium ions being toxic?
What characteristic makes barium sulfate ($BaSO_4$) useful in medical imaging, despite barium ions being toxic?
Which statement regarding strong vs. weak acids and bases is most accurate in the context of neutralization reactions?
Which statement regarding strong vs. weak acids and bases is most accurate in the context of neutralization reactions?
What is the key reason why indicators change color over a range of pH values rather than at a single, distinct pH point?
What is the key reason why indicators change color over a range of pH values rather than at a single, distinct pH point?
How does an insulating mat reduce external errors during procedures with Bunsen burners?
How does an insulating mat reduce external errors during procedures with Bunsen burners?
How should acid be added, when diluting?
How should acid be added, when diluting?
When using a hot water bath, what actions are important?
When using a hot water bath, what actions are important?
What is the process of identify patterns in word equation of neutralization?
What is the process of identify patterns in word equation of neutralization?
What is the main job of desiccant?
What is the main job of desiccant?
What is the job of coagulant?
What is the job of coagulant?
Why does neutralization require the waste to be neutralized with suitable alkalis or acids before it is discharged?
Why does neutralization require the waste to be neutralized with suitable alkalis or acids before it is discharged?
Which of the following must be neutralized with alkalis or acids before it is discharged to prevent water pollution?
Which of the following must be neutralized with alkalis or acids before it is discharged to prevent water pollution?
Flashcards
What is Neutralization?
What is Neutralization?
The process where the acid in lemon juice neutralizes the alkaline substances causing the fishy smell.
pH Values of Acids and Alkalis
pH Values of Acids and Alkalis
Acids have pH values less than 7, while alkalis have pH values greater than 7.
Neutral Solution (pH 7)
Neutral Solution (pH 7)
When the pH value of a solution reaches 7, the solution is neutral, indicating that the acid and alkali have neutralized each other.
General Word Equation for Neutralization
General Word Equation for Neutralization
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Hydrochloric Acid + Sodium Hydroxide
Hydrochloric Acid + Sodium Hydroxide
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Sodium Chloride
Sodium Chloride
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Chemical Change
Chemical Change
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Physical Change
Physical Change
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Ions
Ions
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Thermal Energy in Neutralization
Thermal Energy in Neutralization
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Stomach Acid
Stomach Acid
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Antacids
Antacids
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Factory Waste Neutralization
Factory Waste Neutralization
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Insect Stings and Bites
Insect Stings and Bites
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Treating Insect Stings
Treating Insect Stings
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Lime
Lime
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Neutralization Products
Neutralization Products
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Salt Formation Factors
Salt Formation Factors
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Salt Naming Convention
Salt Naming Convention
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Study Notes
Neutralization
- When a housewife's hands smell fishy after cutting fish, it is because of alkaline substances on the fish.
- Washing hands with lemon juice removes the smell because the acid in lemon juice neutralizes the alkaline substances.
What happens when neutralization occurs?
- Acids have pH values lower than 7.
- Alkalis have pH values higher than 7.
Products of neutralization
- Neutralization forms salt and water.
More about word equations for neutralization
- When hydrochloric acid and sodium hydroxide neutralize each other, a salt and water are formed.
- Because new substances form it is a chemical change.
- The chemical name of the salt formed is sodium chloride.
- The reaction between hydrochloric acid and sodium hydroxide is: hydrochloric acid + hydroxide --> chloride + water
- Neutralization of different acids and alkalis may produce different salts.
Writing word equations for neutralization
- The general format of the word equation for neutralization: acid + alkali --> salt + water
- Example: Hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water.
- Step 1: Write down the reactants of the reaction: hydrochloric acid + sodium hydroxide
- Step 2: Write down the other product, water: sodium chloride + water
- Step 3: Write the salt. In general, the name of a salt consists of two parts.
- The first part (sodium) comes from the alkali used.
- The second part (chloride) comes from the acid used.
- Another example: Sulphuric acid reacts with magnesium hydroxide to form magnesium sulphate and water
- Word equation: sulphuric acid + magnesium hydroxide --> magnesium sulphate + water
Key points about Neutralization
- During neutralization, salt and water are formed, and thermal energy is released.
- The type of salt formed in neutralization depends on the types of acid and alkali that react.
- In general, the name of the salt formed in neutralization consists of two parts:
- The first part comes from the alkali used.
- The second part comes from the acid used.
Applications of neutralization
- Our stomach produces an acid to help digest food.
- Too much acid in the stomach may irritate the stomach wall and cause stomach ache.
- Antacid is alkaline, which helps neutrailize the excess acid, relieving pain.
- Toothpaste helps prevent against tooth decay.
- Many different types of bacteria in our mouth cavity change sugars in food into acids.
- These acids may damage the outer layer of our teeth and finally cause tooth decay.
- Toothpaste is slightly alkaline and neutralizes acids, thereby helping.
- Chemical waste from factories may contain acids or alkalis. If this waste is discharged without being treated properly, it can cause water pollution and harm aquatic life.
- To reduce pollution caused by acids or alkalis, the waste should be neutralized with suitable alkalis or acids before it is discharged.
- Bee stings, mosquito bites and ant bites are acidic.
- The affected area can be treated with an alkaline substance such as soap solution.
- Wasp stings are red and painful, can treat wasp stings with vinegar. Wasp stings are alkaline.
- Soil pH affects crop growth. For example, potatoes and pumpkins grow best in soil of pH 6.0-6.5.
- If the soil is too acidic for the crops, farmers can add lime to it. Lime is alkaline. It helps neutralize acids in the soil, thereby raising the pH value.
- If farmers find that the pH value of the soil is too high for their crops, they may add sulphur to the soil.
- Bacteria in soil can convert sulphur into sulphuric acid, lowering the pH value by neutralizing the alkalis in the soil.
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