Question

A solution of carbon dioxide in water has a hydronium ion concentration of 2.0 x 10^−6M. What is the concentration of hydroxide ion at 25 °C?

Answer 1

[OH⁻] = 5x10⁻⁹ M

Step-by-step explanation:

Kw = 1x10⁻¹⁴

[H₃O⁺] . [OH⁻] = Kw

2x10⁻⁶ . [OH⁻] = 1x10⁻¹⁴

[OH⁻] = 1x10⁻¹⁴ / 2x10⁻⁶ → 5x10⁻⁹