设碳酸钠质量为x.
Na2CO3 + 2HCl == 2NaCl + CO2↓ + H2O
106 73
x 10%*73g
106/x=73/(10%*73g)
x=10.6g
碳酸钠的质量分数为
10.6g/13.6g*100%=78%