Acids and Bases

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid

Which of the following statements is correct?

• Blue litmus paper turns red when placed in a base.
• Red litmus paper turns blue when placed in a base.
• Blue litmus paper stays blue when placed in an acid.
• Red litmus paper stays red when placed in a base.

Which is the stronger acid?

• pH 1
• pH 4
• pH 8
• pH 13

In a base phenolphthalein will give what color?

• Green
• Blue
• Pink
• Clear

Which has a pH above 7?

• Acid
• Base

Which has a pH below 7?

• Acid
• Base

When put into a basic solution, red litmus paper ________.

• stays red
• turns blue
• turns magenta
• turns violet

When acids react with metals, they produce hydrogen gas and salt.

• True

• False

Which of the following are properties of acids?

• They conduct electricity when dissolved in water

• They taste sour

• They react with metals to produce hydrogen gas

• All of the answer choices are correct

Which of the following is an acid?

• vinegar

• bleach

• sugar in water

• starch in water

• toothpaste in water