Problem: 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.

FREE Expert Solution

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-

NaHCO Na+ + HCO3-


HCO3- is a weak acid (and based on the Bronsted-Lowry definitionan 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)

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Problem Details

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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