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jxsung27

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Sodium carbonate reacts with a solution of HCl solution with the evolution of gas (CO2) to yield a solution that is neutral. If 0.265 grams of sodium carbonate are required to neutralize 10.0 mL of HCl solution, what is the proportionality constant linking the mass of sodium carbonate and the volume of HCl solution? Express your answer in terms of (mg/mL), but DO NOT use units, exponential notation or commas in your answer; NUMBERS ONLY.

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First, the applicable rxn:
Na2CO3 + 2HCl -> CO2 + 2NaCl + H2O
This tells us that the mole ratio of sodium carbonate to HCl is 1:1. Given the mass of the sodium carbonate and its mole wt (106), The reactant was present at 265 mg/106g/mole or about 2.5 millimole. So one-tenth of this, or 0.25 millimoles is equivalent to 1 mL solution. You can work from there to go back to mass to get your constant in the correct units. .
 
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