Acid and Bases Learning Check Review

What is an Arrhenius acid?

• A substance that produces H+ in water.

• A substance that produces OH- in water.

Answer explanation

An Arrhenius acid has a H in the beginning of its formula and produces H+ in water.

Tags

HS-PS1-B

What is an Arrhenius base?

• A substance that produces H+ ion in water

• A substance that produces OH- ion in water.

• A substance that produces OH+ ion in water

• A substance that produces H- ion in water.

Answer explanation

An Arrhenius base has a OH at the end of its formula and produces OH- in water.

Tags

HS-PS1-B

A student tests an unknown aqueous solution and finds it conducts electricity and turns litmus paper red. What can the student infer?

• The solution contains an acid.

• The solution contains a base.

• The solutions is neutral.

Answer explanation

Acidic solutions conduct electricity and turn litmus paper red.

Tags

HS-PS1-B

A student tests an unknown aqueous solution and finds it conducts electricity and turns litmus paper blue. What can the student infer?

• The solution contains an acid.

• The solution contains a base.

• The solutions is neutral.

Answer explanation

Basic solutions conduct electricity and turn litmus paper blue.

Tags

HS-PS1-B

Label the acid, base, conjugate acid and conjugate base.

a

b

c

d

conjugate base

base

acid

conjugate acid

Tags

HS-PS1-B

The table shows the pH of several solutions. Which solution has the greatest concentration (amount) of OH^- ions?

• vinegar

• milk

• water

• bleach

Answer explanation

Remember OH^- is another name for a base. So, another way to ask this would be: which of these is the strongest base?

NaOH is a strong base.

What is the pH of a 0.01 M NaOH soltuion?

• 2

• 9

• 12

• 14

Answer explanation

pH = -log[H+]

pOH = 14 - pH

Strong acids and bases...

• do not break apart into ions (non-electrolyte)

• partially break apart into ions (weak electrolyte)

• completely break apart into ions (non-electrolyte)

• completely break apart into ions (strong electrolyte)

Potassium hydroxide

• KOH
• K2OH
• k(OH)2

sulfuric acid

• HSO₃
• H₂SO₃
• H₂SO4
• H3SO4