Acid Base

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madisondesilva1c
Posts: 91
Joined: Fri Sep 28, 2018 12:16 am

Acid Base

Postby madisondesilva1c » Tue Feb 12, 2019 1:07 pm

Is is correct if given a pKa value, to the raise 10^ -pka to find the ka value, then use the expression for ka to solve for H+ concentration, x, to then take the -log of the H+ concentration, to then find the pH?

Are the pKA value and PH related through the Ka constant?

Porus_Karwa_2E
Posts: 72
Joined: Fri Sep 28, 2018 12:24 am

Re: Acid Base

Postby Porus_Karwa_2E » Tue Feb 12, 2019 1:49 pm

Ka is equal to 10^-pka. Once you find the Ka value you can solve for [H+] using the reaction equation. From that we can find pH.
In other words, yes you're correct

Kavvya Gupta 1H
Posts: 35
Joined: Fri Sep 28, 2018 12:21 am

Re: Acid Base

Postby Kavvya Gupta 1H » Tue Feb 12, 2019 1:52 pm

It is correct to take the pKa value and raise it to 10 ^-pKa to get Ka which you can then use for x to solve for [H+] and then take the -log of to get the pH.

pKa and pH correlate to the Ka value but are not equal. Ka refers to how much of acid actually dissociates and pKa gives you the acidity of it. Ka corresponds to pKa and [H+} corresponds to pH

KimGiang2F
Posts: 31
Joined: Fri Sep 28, 2018 12:19 am

Re: Acid Base

Postby KimGiang2F » Tue Mar 12, 2019 4:01 am

If given the pKa, you can use 10^-pKA to get the Ka. Essentially to solve for the [H+] or x value, you set the Ka equal to [products]/[reactants]. To find the pH, you then take the -log of [H+]. The pKa gives you the acidity value of a substance and the Ka value indicates that the amount of acid that actually dissociates.


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