Posted by alex on Monday, April 22, 2013 at 5:55am.
15.0 mL of 8.00 M NaOH was diluted with water to 500 mL. Calculate the molarity
of the diluted NaOH solution.
My calculations:
0.015L x 8.00moles/1L x 39.997/1mole = 4.8g
M= (4.8g x 1mole/39.997) / 0.500L = 0.24M
is my workings correct? Is there another way to get to this?

chemistry  DrBob222, Monday, April 22, 2013 at 1:36pm
It looks ok to me but there is an easier way to do it. If you use the dilution formula you don't need to change the units; just keep everything in mL.
The dilution formula is
mL1 x M1 = mL2 x M2
15 x 8.00 = 500 x M2 and
M2 = 15*8/500 = ?
Usually I don't use the dilution formula. If I know the dilution is from 15 to 500 I know the 8.00 M will be diluted by that factor; therefore,
8.00 x (15.0/500) = ?
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