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A student is asked to analyze a Na2CO3 sample by titrating it with HCl. He/she weighs...

A student is asked to analyze a Na2CO3 sample by titrating it with HCl. He/she weighs out 1.000 g of the unknown, dissolves it in 50 ml of deionized water, and titrates it with 0.100 M HCl. The final equivalence point (i.e., the second one for methyl orange indicator) occurs after the 24.00 mL of HCl have been added. What is the weight of Na2CO3 in the unknown? (Formula weights: Na2CO3 = 105.99 g/mole; HCl = 36.46 g/mole)
A) 0.013 g
B) 0.064 g
C) 0.127 g
D) 0.254 g
E) none of the above

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