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A student investigating the properties of solutions containing carbonate ions prepared a solution containing 6.182 g Na2CO3 in a flask of fvolume 250 mL. Some of the solution was transferred to a buret. What volume of solution should be dispensed from the buret to provide 9.945 mmol Na2CO3? Answer in units of mL.

What volume of solution should be dispensed from the buret to provide 5.633 mmol CO2-3 ? Answer in units of mL.

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