Posted by Lisa, Help needed! on Tuesday, December 7, 2010 at 11:12pm.
Molar mass of CuCl2 is 134.5 g mol^-1
so solution needs to contain
4.53 g / 134.5 g mol^-1
=0.03368 mole
concentration is
0.049 L/0.03368 mole
=1.455 molar
thus we need to dilute the 8.20 M solution by a factor
8.20 M/1.455 M= 5.636
so the new total volume is
131 ml x 5.636
=738.4 ml
check on the concentration
old solution contains
131 x 8.20 mmoles = 1074 mmoles
new solution contains
1.455 x 738.4 mmole = 1074 mmole
Thank you for all the detail, but i'm still confused......so 738.4mL is the answer?
Thank you :)
this answer is incorrect. The following should be switched:
0.049 L/0.03368 mole
=1.455 molar
should be
0.03368 mol/0.049 L
=0.6873 molar
the rest of the steps are correct but you would need to substitute the above number in for the remainder of the problem
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