Answer:
At 30°C, the value of Kw (ion product constant) of water is 1.47×10^−14. Since water is a neutral solution, the concentration of hydroxide ions (OH^-) is equal to the concentration of hydrogen ions (H^+) and can be calculated using the Kw expression:
Kw = [H^+][OH^-]
At equilibrium, the concentration of H^+ and OH^- in pure water are equal and can be represented by x. Thus, we can write:
Kw = x^2
Solving for x, we get:
x = sqrt(Kw) = sqrt(1.47×10^−14) = 1.21×10^−7
Therefore, the concentration of hydroxide ions in pure water at 30°C is 1.21×10^-7 M.
Step-by-step explanation:
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