Sodium carbonate ("soda" or "natron") and potassium carbonate ("potash") have been used since antiquity for cleaning and preservation, as well as for the manufacture of glass. It is sometimes abbreviated as SPC. For example Na2CO3 (s) + H2SO4 (aq)  Na2SO4 (aq) + CO2 (g) + H2O (l) An instructor dropped a 2.50 L bottle of 18.0 M H2SO4 on a cement floor. Proust's experimental work helped form the Law of Definite Proportions, sometimes called the Law of Definite Composition. Sodium Carbonate (Na2CO3)is used to neutralize the. The Molecule contains 1 oxygen atom. google_ad_channel = "8676120346+6447453269"; The experiment should be performed two times and the results averaged. How much sodium carbonate. That means it is usually contaminated with disodium carbonate Na2CO3.