Homework Help: chemistry

Posted by Fai on Saturday, August 11, 2012 at 10:38pm.

A solution of sodium cyanide nacn has a ph of 12.10. How many grams of nacn are in 425ml of solution with the same ph?
I do not understand how to calculate this question. Who helps me to solve it for me. Thank you. The right answer 209gm.

A 0.446g sample of an unknown monoprotic acid was titrated with 0.105M koh the molar mass is 120g/mol. What is the pka value

Who helps me to solve it

chemistry - DrBob222, Saturday, August 11, 2012 at 11:07pm
I have worked the NaCN problem for you before. It's a hydrolysis problem. About a week ago. I don't believe the second problem can be solved with the information given.

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