Assay of Sodium Carbonate

Molecular Formula: Na2CO3 

Molecular Weight: 105.9 

Assay: Weigh accurately about 1.0 g, dissolve in 25 mL of water, and titrate with 1 M  hydrochloric acid using methyl orange solution as indicator. 


Na2CO3 + 2HCl → 2NaCl + H2CO3 

H2CO3 → H2O + CO2

Factor Calculation: 

2 Moles of HCl ≅ 1 Mole of sodium carbonate 

2000 mL of 1M HCl ≅ 105.9 g of

Na2CO3  1 mL of 1M HCl ≅ 0.05299g of Na2CO3

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