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April 17, 2014

Homework Help: Chemistry

Posted by Chemistry Confused on Tuesday, April 13, 2010 at 8:48pm.

Two Concept Questions for you:

1) Why is the concentration of a solution such as NaH2PO4 ignored when calculating the pH given Ka1, Ka2, and K3 values?

2) Given Pka1=3.13, Pka2=4.76, and Pka3 = 6.40, calculate the pH of lemon juice which is about 5% citric acid.
--I know I have to just go pH= (1/2) pka1,
but why is it just (1/2) of Pka1? Where did the (1/2) come from?

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