We are being asked the mass of NaHCO3 in the mixture of Na2CO3 and NaHCO3
Na2CO3 and NaHCO3 break down in solution in the following manner:
Na2CO3 → 2 Na+ + CO32-
NaHCO3 → Na+ + HCO3-
HCO3- is a weak acid (and based on the Bronsted-Lowry definition, an acid is a proton (H+) donor. Once HCO3- loses its proton, its conjugate base is formed).
HCO3-aq) + H2O(l) ⇌ CO32-(aq) + H3O+(aq)
(weak acid) (base) (conjugate base) (conjugate acid)
A mixture of Na2CO3 and NaHCO3 has a mass of 82.1 g . It is dissolved in 1.00 L of water and the pH is found to be 9.92.
Find the mass of NaHCO3 in the mixture.
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