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Some quanity of Na2CO3 has been dissolved in water. You titrate the solution with 0.100 M...

Some quanity of Na2CO3 has been dissolved in water. You titrate the solution with 0.100 M HCl (aq) and determine that 40.00 mL of 0.100 M HCl (aq) is required to reach the end point of a titration. What mass of Na2CO3 was present in the sodium carbonate solution?

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