pH, acid and bases

The pH scale is a range from:

• 1–7

• 1–5

• 0–14

• 1–20

Acidic solutions have pH values of:

• Greater than 7 (>7)

• Less than 7 (<7)

• Equal to 7 (7)

• Between 0–14

Basic solutions have pH values

• Greater than 7 (>7)

• Less than 7 (<7)

• Equal to 7 (7)

• Between 0–14

Neutral solutions have pH values

• Greater than 7 (>7)

• Less than 7 (<7)

• Equal to 7 (7)

• Between 0–14

What does pH measure?

• The amount of hydrogen (H⁺) ions

• The amount of hydroxide (OH^–) ions

• The amount of water

• All of the above

Red litmus paper is what colour in acidic solutions?

• Red

• Blue

• Purple

• White

In a test of pH levels, sodium bicarbonate (baking soda) has a pH of 9 and bleach has a pH of 11. What is true about their relationship?

• Both of the solutions are basic

• Both of the solutions are acids

• The sodium bicarbonate is an acid and the bleach is a base

• The sodium bicarbonate is an base and the bleach is an acid

A solution has a pH of 7.0. What would happen to the pH if H⁺ ions were added?

• pH would go up

• pH would go down

• pH would stay the same

• None of these

A substance that is a base has more OH^– ions to H⁺ ions

• True

• False

If pure water is added to an acid with a pH of 3, what happens to the pH of the solution?

• The pH increases to above 3

• The pH decreases to below 3

• The pH stays the same

Tags

NGSS.MS-PS1-2