At a certain temperature, the pHpH of a neutral solution is 7.50. What is the value...

Question

Question

At a certain temperature, the pHpH of a neutral solution is 7.50. What is the value of KwKwK_w at that temperature?

Express your answer numerically using two significant figures.

science chemistry

Answer 1

Answer #1

We know neutral solution has pH = pOH and also, we know, pH + pOH = pKw. Thus,

pKw = 2 pH = 2 x 7.50 = 15.0.

Thus, - log Kw = 15.0

or, log Kw = - 15

or, Kw = 10-15

Approximating to two significant figure, Kw = 1.0 x 10-15 .

Answer 2

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