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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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tonki tonki
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11 years ago
You are making a stock solution of NaOH. What mass of NaOH must you add to a one liter volumetric flask so that the stock solution has a concentration of 0.52 M after dilution to the mark with water?

I'd know how to solve it if they'd given a starting molarity, but this is all the info I've got! Could someone please explain how to solve this problem?
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#1
11 years ago
This question asks for a mass of NaOH, that is, a gram amount.

0.52 x 40 = 20.8 g
wrote...
#2
11 years ago
Moles = Molarity x Volume

if you need 1 L of 0.52 M NaOH

moles = 0.52 M x 1 L = 0.52

mass NaOH = 0.52 mol x 40 g/mol= 20.8g

20.8 g of NaOH + enought water to reach the volume of 1 L
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