chemistry

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6.0g of impure and hydrous Na2SO4 were made up to 1dm^3 of solution neutralize 22.20cm^3 of 0.1mol/dm^3 of HCL.calculate:
a)concentration of Na2CO3 in mol/dm^3.
b)concentration of Na2CO3 in gram/dm^3.
c)percentage purity in carbon.

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