Question

1. At the freezing point of water (0∘C), K_w=1.2×10⁻¹⁵. Calculate [H⁺] and [OH⁻] for a neutral solution at this temperature.

2. Which solution below has the highest concentration of hydroxide ions?

	pH = 6.0
	pH = 7.6
	pH = 4.5
	pH = 9.2
	pH = 12.4

3. Which solution below has the highest concentration of hydronium ions?

	pH = 6.5
	pH = 13.5
	pH = 9.9
	pH = 3.1
	pH = 7.7

4. An aqueous solution at 25.0°C contains [H⁺] = 0.085 M. What is the pH of the solution?

	1.2 x 10-13
	1.07
	13.0
	-1.0
	0.0850

5. The pH of an aqueous solution at 25.0 °C is 10.40. What is the molarity of H⁺ in this solution?

	1.0 x 10-13
	4.0 x 10-11
	2.5 x 1010
	3.60
	2.5 x 10-4