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We can measure the concentration of HCl solution by reaction with pure sodium carbonate: 2H^+ +Na_2CO_3 -->2Na^+ +H_2O + CO_2. Complete reaction with 0.9674 + and - 0.0009g of Na_2CO_3 (FM 105.9884 + and - 0.0007) required 27.35 + and - 0.04 mL of HCl. Find the molarity of the HCl and its absolute uncertainty.

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