Homework Question


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305113590
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Homework Question

Postby 305113590 » Sun Feb 24, 2019 2:20 pm

What range in volts does a voltmeter need to have to measure pH in the range of 1 to 14 at 25 Celsius if the voltage is zero when pH is 7?

I understand everything for the most part, but can anyone explain to me why we have to do this:

.025693ln(0.1/1x10^-13)= 0.710V
.025693ln(1x10^-14/1.0)=-0.828V

Why is do we have those values for lnK? Why specifically 1x10^-13 and 1.0?

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Re: Homework Question

Postby Chem_Mod » Mon Feb 25, 2019 2:32 pm

1 x 10–13 is the concentration of OH(aq) at a pH of 1, and 1.0 is [OH] at pH 14.

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Re: Homework Question

Postby Chem_Mod » Mon Mar 11, 2019 5:28 pm

On closer inspection, this appears to be a mistake. Use


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