Homework Help: Chemistry

Posted by Deanna on Tuesday, October 18, 2011 at 7:44am.

0.7g of an unknown mixture of NaHCO3 and Na2CO3 is mixed with 3mL of 12M HCl.what is the mass of NaHCO3 and Na2CO3 in the mixture of NaHCO3 and Na2CO3? Use these equations:
NaHCO3+HCl--> NaCl+CO2+H2O
Na2CO3+2HCl-->2NaCl+CO2+H2O
mass of mixture= mass of NaHCO3+mass of Na2CO3
moles of NaCl=2(moles of Na2CO3)+1(moles of NaHCO3)

Chemistry - DrBob222, Tuesday, October 18, 2011 at 1:06pm
Let X = mass Na2CO3
then Y = mass NaHCO3
=========================================
X + Y = 0.7g
X(2/molar mass Na2CO3) + Y(1/molar molar mass NaHCO3) = 0.036

Solve the two equations simultaneously for X.

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