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July 3, 2015

Homework Help: Chemistry

Posted by Marcus on Tuesday, April 9, 2013 at 5:12pm.

The question is: what is the ratio [NH3/[NH4+] in an ammonia/ammonium chloride buffer solution with pH= 10.00? (pKa for ammonia=9.25)

When working the problem, I tried to solve it a bit backwards, in that I plugged in each of the multiple choices I was given to see which would equal 10.

Such as:
pH=pKa +log(salt/base)
9.25 +log(5.62)=10 pH

So my ratio would be 5.62 since that number makes it equal 10, or am I just doing this completely wrong?

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