Question 13.33

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Annah Khan 1B
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Joined: Fri Jul 22, 2016 3:00 am

Question 13.33

Postby Annah Khan 1B » Tue Aug 01, 2017 5:13 pm

"Suppose that 4.25 g of an unknown monophonic acid weak acid, HA, is dissolved in water. Titration of the solution with 0.350 M NaOH(aq) required 52.0 mL to reach the stoichiometric point. After the addition of 26.0 mL, the pH of the solution was found to be 3.82. (a) What is the molar mass of the acid? (b) What is the value of pKa for the acid?"

I have figured out (a), but I am having trouble with (b). I'm not sure how to solve for this. Could someone please explain this to me? Thanks!

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Re: Question 13.33

Postby Chem_Mod » Tue Aug 01, 2017 10:29 pm

The halfway to stoichiometric point is where your pH = pKa.

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