Acids and Bases Flashcards

Questions and Answers

What are bases?

A substance that forms when metals react with water.

What are acids?

A substance that reacts with metals and releases hydrogen.

What is the pH scale?

The pH scale measures how acidic or basic a substance is.

What is the range of the pH scale?

The pH scale ranges from 0 to 14. A pH of 7 is neutral. Signup and view all the answers

What range on the pH scale indicates that a substance is an acid or base?

A pH of 0 to less than 7 is acidic. A pH greater than 7 is basic. Signup and view all the answers

What is an indicator?

An indicator is a substance that changes color in acids and bases. Signup and view all the answers

Give an example of an indicator used to test acids.

Litmus paper can be red or blue and can be used for acids and bases. Signup and view all the answers

What color do acids change blue and red litmus paper?

Acids turn blue litmus paper red and do not change the color of red litmus paper. Signup and view all the answers

When acids mix with most metals, what type of gas is given off?

Hydrogen gas is given off in this reaction. Signup and view all the answers

What type of taste do acids have?

Acids have a sour taste. Signup and view all the answers

What type of taste do bases have?

Bases have a bitter taste. Signup and view all the answers

What color do bases turn red and blue litmus paper?

Bases turn red litmus paper blue and do not change the color of blue litmus paper. Signup and view all the answers

What does phenolphthalein indicate for acids and bases?

Phenolphthalein turns a solution clear for acids and deep pink for bases. Signup and view all the answers

How do acids and bases affect metal?

Acids wear away metal; bases do not. Signup and view all the answers

What characteristics do acids and bases share?

Acids and bases have different strengths. They can be very dangerous to touch or taste. Signup and view all the answers

If you touch a harmless base, how will it feel?

It would feel slippery. Signup and view all the answers

Do acids have any special feel?

False Signup and view all the answers

What is the name of the base that can be found in soap?

Soap contains a base called lye. Signup and view all the answers

Is vinegar an example of an acid or base?

Acid Signup and view all the answers

Is ammonia an example of an acid or base?

Base Signup and view all the answers

Study Notes

Acids and Bases Overview

Bases are substances formed when metals react with water.
Acids react with metals, releasing hydrogen gas during the reaction.

pH Scale

The pH scale measures acidity or basicity, with a range from 0 to 14.
A pH of 7 indicates neutrality; pH below 7 indicates acidity, while pH above 7 indicates basicity.

Indicators

Indicators are substances that change color in response to acids or bases.
Litmus paper is a common indicator: it turns blue litmus paper red in the presence of acids and does not change red litmus paper.
Phenolphthalein serves as another indicator; it turns clear for acids and deep pink for bases.

Taste and Feel

Acids have a sour taste, whereas bases possess a bitter taste.
Bases, like soap, feel slippery; acids do not have any distinctive feel.

Effects on Metal and Safety

Acids can corrode or wear away metals, while bases do not affect metals in the same way.
Both acids and bases can have varying strengths and may be dangerous to touch or taste.

Common Examples

Vinegar is identified as an acid, while ammonia is recognized as a base.
Soap contains a base known as lye.

Reaction with Metals

When acids mix with metals, hydrogen gas is released as a byproduct.

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Description

Test your knowledge of acids and bases with these flashcards. Each card covers key terms such as acids, bases, and the pH scale, providing definitions to enhance your understanding. Perfect for students looking to reinforce their chemistry concepts.