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September 20, 2014

Homework Help: Chemistry

Posted by Anonymous on Thursday, April 26, 2012 at 9:59pm.

What mass of solid potassium nitrite would need to be dissolved in 500. mL of 0.40 M HNO2 to make 500. mL of a NO2−/HNO2 buffer solution that has a pH = 3.25? Ka of HNO2 = 7.1 x 10−4. (Assume no significant volume change during dissolution of the potassium nitrite)
(1) 3.3 g (2) 6.5 g (3) 11 g (4) 21 g (5) 42 g

I know the answer is 21 g, but I cannot seem to get this answer when I'm working out the problem.

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