31 Questions
Which of the following best describes the characteristic taste of acids?
Sour
What happens when a strong acid is dissolved in water?
It dissociates completely and gives off many H+ ions
What is the Latin meaning of the word 'acidus'?
Sharp
What type of acid reacts with metals and carbonates to produce gas?
Strong acid
What is another word for a base?
Alkaline
Which characteristic is NOT true for bases?
Contain H+ ions
What is the measure of how acidic or basic a solution is?
pH
Why do bases feel slippery or soapy?
They react with fatty acids in the skin
Which pH value represents a neutral solution?
pH 7
What is the purpose of an acid-base indicator?
To change color in the presence of an acid or base
Which characteristic is NOT true for litmus?
Is used to measure pH
What happens when an acid and base react with each other?
The characteristic properties of both are destroyed
What is the pH range for edible substances?
$2-8$
What is the purpose of a universal indicator?
To change color through a wide range of pH values
"pH" stands for which of the following?
"Potential of Hydrogen"
An acid is a substance that releases ______ ions in an aqueous solution
H+
The more ______ ions, the more acidic the solution
H+
A strong acid dissociates completely when in aqueous solution, giving off many ______ ions
H+
Acids react with metals and carbonates to produce ______
gas
A base is a substance that releases ______ ions in an aqueous solution
hydroxide
The more ______ ions, the more basic (or alkaline) the solution
OH-
A solution with a pH of 7 is considered ______.
neutral
Litmus turns ______ in acidic solutions.
red/pink
The compound that separates into sodium ions (Na+) and hydroxide ions (OH-) when dissolved in water is called ______.
sodium hydroxide (NaOH)
An acid-base indicator is a compound that will change color in the presence of an ______ or base.
acid
Bases feel soapy or slippery because they react with acid molecules in the skin called ______ acids.
fatty
The pH scale is a measure of how acidic or basic a solution is, with pH standing for the power of ______ or potential of Hydrogen.
Hydrogen
Everything above 7 on the pH scale is considered a ______.
base
Mixing acids and bases results in the formation of ______.
water
A universal indicator is a mixture of chemicals that changes colors through a wide range of ______ values.
pH
The color of some flowers is dependent upon the ______ of the soil.
pH
Study Notes
Acids and Bases
- Acids have a characteristic sour taste
- Strong acids dissociate completely in water, releasing many H+ ions
- The Latin word 'acidus' means sour
- Acids react with metals and carbonates to produce gas
- A base is also known as an alkali
- Bases do not feel slippery or soapy due to their pH, but due to reacting with skin acid molecules
- The pH scale measures how acidic or basic a solution is
- pH 7 represents a neutral solution
- Acid-base indicators change color in the presence of an acid or base
- Universal indicators change color through a wide range of pH values
pH Scale
- pH values below 7 are acidic
- pH values above 7 are basic or alkaline
- pH stands for the power of Hydrogen or potential of Hydrogen
Chemical Reactions
- Acids release H+ ions in an aqueous solution
- The more H+ ions, the more acidic the solution
- Bases release OH- ions in an aqueous solution
- The more OH- ions, the more basic (or alkaline) the solution
- Acids react with bases to form salts and water
- Sodium hydroxide (NaOH) is a compound that separates into sodium ions (Na+) and hydroxide ions (OH-) when dissolved in water
Properties and Characteristics
- Litmus turns red in acidic solutions
- Bases feel soapy or slippery due to reacting with skin acid molecules
- Edible substances typically have a pH range of 5.5-8.5
- The color of some flowers is dependent on the pH of the soil
Test your knowledge about acids and their sources with this quiz. Learn about the properties of acids and common sources of different types of acids.
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