Question

1-Find [OH−][OH−] for a 0.010 MM solution of NaOHNaOH.

2-Find the pHpH of a 0.010 MM NaOHNaOH solution.

3-Calculate the pH of a 0.10 MM solution of barium hydroxide, Ba(OH)2Ba(OH)2.

4-Calculate the pHpH of a 0.10 MM solution of NaOHNaOH.

5-Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows:

C5H5N+H2O⇌C5H5NH++OH−C5H5N+H2O⇌C5H5NH++OH−

The pKbpKb of pyridine is 8.75. What is the pH of a 0.165 MM solution of pyridine? (Assume that the temperature is 25 ∘C∘C.)

6-Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid ionizes in water:

C6H5COOH⇌C6H5COO−+H+C6H5COOH⇌C6H5COO−+H+

The pKapKa of this reaction is 4.2. In a 0.65 MM solution of benzoic acid, what percentage of the molecules are ionized?

Answer 1