Acid Base practice (Unit 13)

An acid has a pH

• higher than 7

• lower than 7

• 7

• greater than 14

Answer explanation

What is true at neutral pH of 7?

• [H⁺] > [OH^-]

• [H⁺] < [OH^-]

• [H⁺] = [OH^-]

• no ions are present

The table shows the pH of several solutions.

For which substance is its [OH^-] greater than its [H⁺]?

• vinegar

• milk

• water

• bleach

Answer explanation

Bases have low concentration of H⁺ , but high concentration of OH^-

(consider that bases typically have hydroxide, OH^-, in their formula)

What is the purpose of a pH indicator?

• changes color if a chemical reaction occurs

• changes color if a physical change occurs

• changes color due to change in H⁺ concentration

• changes color when a salt dissolves in water

What color will the indicator methyl orange be if the pH of solution is 8?

• orange

• yellow

• red

• blue

What color will the indicator bromcresol green be if the pH of solution is 6?

• green

• yellow

• red

• blue

What are the products of a neutralization reaction?

• H₂ + Ionic Salt
• H₂O + Ionic Salt
• H₃O⁺ + Ionic Salt
• OH^- + Ionic Salt

An Arrhenius base increases the concentration of which ion in aqueous solution?

• hydrogen, H⁺

• hydronium, H₃O⁺

• hydroxide, OH^-

• dihydrogen monoxide, H₂O

In a test of pH levels, a solution of baking soda has a pH of 9 and bleach has a pH of 13. What is true about the solutions?

• Both of the solution are bases

• Both of the solution are acids

• The baking soda is an acid and the bleach is a base

• The baking soda is a base and the bleach is an acid.

Solution Z has a pH of 9.

Solution Y has H⁺ concentration 100,000 times greater than solution Z.

What is the pH of solution Y?

• 2

• 14

• 6

• 4