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Question

Determine the concentration of hydronium and hydroxide ions in a solution that has a pH of 1.6. 

Answer 1

Hi Billy,

Recall that the concentration of hydronium is given by [H₃O⁺] = 10^-pH. Since the pH is 1.6, we get that the concentration of hydronium is 10^-1.6 = 0.025 M.

Likewise, the concentration of hydroxide is given by [OH^-] = 10^-pOH. Remember that pOH is the opposite of pH, defined as 14 - pH. Because pH = 1.6, pOH = 14 - 1.6 = 12.4. So, the concentration of hydroxide is

10^-12.4 = 3.98 × 10^-13 M.

Hope this helps,

Akshat Y.