CHEM 1212K Exam 3 Practice Questions

Front

What is an Arrhenius acid?

Back

An Arrhenius acid is a substance that produces H+ ions in aqueous solutions.

Front

What happens to the pH at the equivalence point when titrating acetic acid with sodium hydroxide?

Back

The pH will be greater than 7 at the equivalence point.

Front

How do you determine the molar solubility of AgI in pure water given Ksp (AgI) = 8.51 × 10–17?

Back

The molar solubility of AgI is 9.22 × 10–9 M.

Front

What precipitate forms after adding 6 M HCl to a solution containing Co2+, Ba2+, Ag+, NH4+, and Cu2+?

Back

CoS is the precipitate formed.

Front

What is the pH of a 0.187 M solution of HF (Ka for HF is 6.8 × 10−4)?

Back

The pH is 1.95.

Front

Define Ksp (solubility product constant).

Back

Ksp is the equilibrium constant for a solid substance dissolving in an aqueous solution.

Front

What is the significance of the equivalence point in a titration?

Back

The equivalence point is when the amount of titrant added is stoichiometrically equivalent to the amount of substance in the sample.

Front

What is the formula for calculating pH from H+ concentration?

Back

pH = -log[H+].

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25 °C.

Front

What is a weak acid? Give an example.

Back

A weak acid is an acid that partially dissociates in solution. Example: HF.