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September 3, 2014

Homework Help: AP Chemistry

Posted by Jessie on Sunday, April 25, 2010 at 12:24pm.

A buffer solution contains .4mol of formic acid, HCOOH and a .6mol of sodium formate, HCOONa, in 1L of solution. Ka of formic acid is 1.8 x 10^-4.

a) calculate pH
b) if 100ml of this buffer solution is diluted to a volume of 1L with pure water, the pH does not change. Discuss why the pH remains constant on dilution.
c) a 5ml sample of 1M HCl is added to 100ml of the original buffer solution. Calculate [H3O+] of the resulting solution.
d) a 800ml sample of 2M formic acid is mixed with 200ml of 4.8M NaOH. Calculate the [H3O+] of the resulting solution.

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