Test 2


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alanaarchbold
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Joined: Fri Sep 28, 2018 12:27 am

Test 2

Postby alanaarchbold » Thu Mar 07, 2019 9:30 pm

Can someone list the steps for the pH question from test two please

Chem_Mod
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Re: Test 2

Postby Chem_Mod » Thu Mar 07, 2019 9:59 pm

The idea is to calculate Kw at non-room temperature using Nernst Equation. When you know Kw, you can find the concentration of H3O+ in a neutral solution at that temperature by taking the square root of Kw and calculate the PH of the neutral solution.

Chloe Thorpe 1J
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Re: Test 2

Postby Chloe Thorpe 1J » Thu Mar 07, 2019 10:19 pm

I thought we weren't supposed to use the Nernst equation on test 2?

Lauren Huang 1H
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Re: Test 2

Postby Lauren Huang 1H » Fri Mar 08, 2019 12:22 pm

I think they meant the Van't Hoff equation; it was provided to us on the equation sheet.

Sapna Ramappa 1J
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Re: Test 2

Postby Sapna Ramappa 1J » Fri Mar 08, 2019 12:34 pm

Use Van't Hoff to find the new kw with the temperature change. Then, take the square root of the new kw to find the concentration of H3O+. Then, you can take -log[H3O+] to find pH, which you can now compare to the pH of 7! Hope this helps!


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