The ion-product constant (Kw) for water at 75 °C is 2.0*10-13. What is the pH of pure water at this temperature? O 6.4 7.4 13.4 6.7 7.0 OO O

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The ion-product constant (Kw) for water at 75 °C is 2.0*10-13. What is the pH of pure water at
this temperature?
6.4
7.4
13.4
6.7
7.0
Transcribed Image Text:The ion-product constant (Kw) for water at 75 °C is 2.0*10-13. What is the pH of pure water at this temperature? 6.4 7.4 13.4 6.7 7.0
Expert Solution
Step 1

To find the pH you need first to find the hydrogen ion concentration (or hydroxonium ion concentration - it's the same thing). Then you convert it to pH.

In pure water at room temperature the Kw value tells you that:

[H+] [OH-] = kw

But in pure water, the hydrogen ion (hydroxonium ion) concentration must be equal to the hydroxide ion concentration. For every hydrogen ion formed, there is a hydroxide ion formed as well.

That means that you can replace the [OH-] term in the Kw expression by another [H+].

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