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Molarity (Fundamental G, Problem 5b)

Posted: Mon Oct 02, 2017 4:00 pm
by Abby Ellstrom 1I
A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain 4.98 mmol CO3^2- ion?

I used the M1V1=M2V2 equation.
0.00498 mol CO3^2- / 0.079 M = 63.02 mL

However the answer is 62.05 mL, anyone have any suggestions?

Re: Molarity (Fundamental G, Problem 5b)  [ENDORSED]

Posted: Mon Oct 02, 2017 4:20 pm
by SitharaMenon2B
If you don't round the molarity (I used 0.07967 M) then you get 0.0625 L, or 62.5 mL, which appears to be the right answer