HS Physical Science Sem 2 Unit 9 Acids and Bases

What is pH?

• how acidic a solution is

• how basic a solution is

• the concentration of hydrogen ions in a solution

• the concentration of potassium ions in a solution

What is a characteristic of a base?

• tastes sour

• turns litmus paper red

• increases amount of hydrogen ions

• is slippery

What can a base substance do to a hydroxide ion?

• accept

• bond with

• donate

Which type of solution turns litmus paper red?

• an acid

• a base

• a neutral solution

Which substances resist pH

changes?

• acids

• bases

• buffers

• hydrogen ions

What is an example of a strong acid?

• HCl

• NaCl

• NaOH

• OH−

What could be used to buffer vinegar?

• salt

• flour

• sugar

• baking soda

What happens to the hydrogen-ion concentration as pH

increases?

• It increases.

• It decreases.

• It equals the pH number.

What does a pH

of 7 indicate about a substance?

• It is acidic.

• It is basic.

• It is neutral.

• It is reactive.

In water, what happens to a base?

• It forms hydrogen ions (H+).

• It forms hydroxide ions (OH−).

• It evaporates.

• It condensates.