Acids and bases

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aaronharouni
Posts: 72
Joined: Fri Sep 28, 2018 12:15 am

Acids and bases

Postby aaronharouni » Tue Jan 22, 2019 9:12 pm

In questions 6D.3, how do you find the Kb constant? Im having a lot of trouble figuring that out.
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Ricky Ma DIS 4E
Posts: 72
Joined: Fri Sep 28, 2018 12:27 am

Re: Acids and bases

Postby Ricky Ma DIS 4E » Tue Jan 22, 2019 10:48 pm

You use the pH to find the pOH in which you can then use to find the concentration of OH-. From that you just set the quadratic equation and solve Kb from there.
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Dina Geotas 4A
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: Acids and bases

Postby Dina Geotas 4A » Wed Jan 23, 2019 4:19 pm

To find the Kb, you subtract 11.86 from 14 to get 2.14 as the pOH. From there you solve for the concentration of [OH] = .0072 mol/L, which is labeled x in the ice chart. Using the ice chart, you set up Kb, putting in .0072 as x. From this you can find Kb= 5.6x10^-4 and pKb=-log(Kb)= 3.25.
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