EmSAT EmSAT Chemistry 5

Question 1

What is the pH of a strong acid with [H⁺] = 0.01 M?

Accepted Answer

2

Answer

pH = −log[H⁺] = −log(0.01) = −log(10⁻²) = 2.

Question 2

What happens when a weak acid dissolves in water?

Accepted Answer

It partially ionizes, reaching equilibrium

Answer

Weak acids only partially ionize in water, establishing an equilibrium between the ionized and non-ionized forms. This contrasts with strong acids, which fully dissociate.

Question 3

What is a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added

Answer

A buffer solution resists significant changes in pH when small amounts of acid or base are added. Buffers typically consist of a weak acid and its conjugate base (or vice versa).

Question 4

In a titration, what is the equivalence point?

Accepted Answer

When moles of acid equal moles of base

Answer

The equivalence point in a titration is the point at which the moles of acid are exactly equal to the moles of base — they have completely neutralized each other.

Question 5

What is the conjugate base of H₂CO₃?

Accepted Answer

HCO₃⁻

Answer

When H₂CO₃ donates a proton (H⁺), it becomes HCO₃⁻ (bicarbonate ion), its conjugate base. Conjugate base = acid − one proton.

EmSAT Practice Test

EmSAT Practice Test

EmSAT EmSAT Chemistry 5