Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: naturelover on November 19, 2014, 12:20:59 PM
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I have a question relating to finding the concentations of A and B in the sample.
(The question is attached in JPEG format below).
My question is:
4) Find the concentrations of A and B in the sample - the answer is: Ca= 0.082mM and Cb=0.107mM
I sadly can't seem to get back or work out the answers ...
I've tried the calculations myself.. (and i think this is the way to calculate it?)
Ca= 0.82-0.125cb/9.82
0.91=2.16 (0.82-0.125cb/9.82) + 6.8cb
0.91=0.1804-0.02749cb+6.8cb
but the answers I got were all wrong... can anyone please help me solve this or tell me how to calculate it?
thank you!
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This is a simple algebra, and the answers given are OK.
Ca= 0.82-0.125cb/9.82
That's wrong. Use parentheses.