14.2 pH and pOH

Explain why a sample of pure water at 40 °C is neutral even though [H₃O⁺] = 1.7 $\times$ 10⁻⁷ M. K_w is 2.9 $\times$ 10⁻¹⁴ at 40 °C.

The ionization constant for water (K_w) is 9.311 $\times$ 10⁻¹⁴ at 60 °C. Calculate [H₃O⁺], [OH⁻], pH, and pOH for pure water at 60 °C.

Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:

(a) 0.000259 M HClO₄

(b) 0.21 M NaOH

(c) 0.000071 M Ba(OH)₂

(d) 2.5 M KOH

What are the hydronium and hydroxide ion concentrations in a solution whose pH is 6.52?

Calculate the hydronium ion concentration and the hydroxide ion concentration in lime juice from its pH. See the figure for useful information.

The hydroxide ion concentration in household ammonia is 3.2 $\times$ 10⁻³ M at 25 °C. What is the concentration of hydronium ions in the solution?