Understanding Acids and Bases

What distinguishes a monoprotic acid from a polyprotic acid?

• Monoprotic acids can transfer only one proton.

• Polyprotic acids can transfer only one proton.

• Monoprotic acids can transfer multiple protons.

• Polyprotic acids cannot transfer any protons.

Which of the following is an example of a diprotic acid?

• Sulfuric acid

• Phosphoric acid

• Carbonic acid

• Hydrochloric acid

How many times can phosphoric acid deprotonate?

• Once

• Twice

• Three times

• Four times

In a five molar solution of phosphoric acid, why are the second and third deprotonations considered negligible?

• Because they produce no hydronium ions.

• Because they have very high Ka values.

• Because they occur simultaneously.

• Because they do not affect the pH significantly.

What is the Ka value for the second deprotonation of sulfuric acid?

• 10^-8

• 4.3 * 10^-7

• 5.6 * 10^-1

• 0.012