### Molarity (Fundamental G, Problem 5b)

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**Mon Oct 02, 2017 4:00 pm**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?

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?