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A nitric acid solution is standardized with 0

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A nitric acid solution is standardized with 0.500 g of sodium carbonate, Na2CO3 (a solid base used as a standard). Find the molarity of the nitric acid if 38.50 mL are required to reach a permanent endpoint.

2HNO3 (aq) + Na2CO3 (s) --> 2 NaNO3 (aq) + H2O (l) + CO2 (g)

 

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Molar mass of Na2CO3 =106 g/mol

Moles of Na2CO3 =Mass/Molar mass

=0.500g/106g/mol

=0.004717 mol

From the balanced reaction,

At end point,

Moles of HNO3 =2×Moles of Na2CO3=2×0.004717

=0.009434 mol

Molarity of HNO3=Moles/Volume(L)

=0.009434mol/0.0385 L

=0.245 M

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