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Questions and Answers
Alkali has a sour taste.
Alkali has a sour taste.
False
The term 'acid' originates from Latin and means sour.
The term 'acid' originates from Latin and means sour.
True
Low numbers on the litmus paper indicate high acidity.
Low numbers on the litmus paper indicate high acidity.
True
The pH scale is solely used to measure the strength of acids.
The pH scale is solely used to measure the strength of acids.
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A base is defined as a substance that reacts with acids to produce hydrogen gas.
A base is defined as a substance that reacts with acids to produce hydrogen gas.
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If a red litmus paper is soaked in an alkaline solution, it will turn blue.
If a red litmus paper is soaked in an alkaline solution, it will turn blue.
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Acid rain can have a pH value as low as 2.5.
Acid rain can have a pH value as low as 2.5.
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The distilled water is considered a neutral substance according to its pH value.
The distilled water is considered a neutral substance according to its pH value.
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Study Notes
Acid-Base Concepts
- Alkali does not have a sour taste; acids do.
- The term "acid" originates from Latin, meaning "sour."
- Alkalis do not corrode metal and rocks; acids typically cause corrosion.
Definitions and Reactions
- A base reacts with acids to form water and a salt; this is known as neutralization.
- In Arabic, bases that dissolve in water are referred to as "ashes of the plant."
- Alkali refers specifically to plant ashes, highlighting a historical context.
Properties of Acids and Bases
- Acids can be neutralized by alkalis, balancing the chemical reaction.
- Litmus paper is used to detect acidity or alkalinity; it changes color based on pH.
- Litmus dye is not green; it is generally red or blue depending on pH.
Litmus Paper Changes
- Gray litmus paper turns red in acidic solutions.
- Red litmus paper changes to blue in alkaline solutions.
pH Scale
- The pH scale measures both acidity and alkalinity, not just acidity.
- It quantifies hydrogen ion concentration on a scale from 1 (most acidic) to 14 (most alkaline).
- Low pH values indicate high acidity; higher values indicate lower acidity or higher alkalinity.
pH Values
- Distilled water is considered neutral with a pH value of 7.
- Water with a pH value of 7 is neutral, not acidic.
- Acidic rain is formed from the reaction of burning fossil fuels and automotive emissions with water, lowering pH.
- Acid rain can have a pH as low as 2.5, indicating strong acidity.
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Description
Test your knowledge of basic chemistry concepts with this true or false quiz. Read each statement carefully and determine if it is correct or incorrect. Great for reviewing foundational ideas in chemistry!
