Homework Help: chemistry

Posted by hongkong on Saturday, April 24, 2010 at 10:02am.

Solution A, while in a 1.0 cm cell, has an absorbance of 0.390 and a [Cu2+] = 0.0283 M. Then, 6.57 mL of solution A is diluted with pure water to 100.0 mL. What is the absorbance of this diluted solution?

I tried but I still don't get it. Can anyone please help! :( Thanks!

chemistry - DrBob222, Saturday, April 24, 2010 at 12:25pm
Solution A initial:
Absorbance = kc
Substitute A and c, calculate k.

Diluted solution:
new concn = 0.0283 x (6.57/100)
Substitute k and new c, calculate Absorbance.

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