Mass Balance Approach for Multiple Equilibria

Calculate the solubility of CaC204 in a solution containing 0.0010 M hydrochloric acid. 

This compares with a calculated solubility in water using Equation 11.1 of 

1 X 10 M. We can obtain the concentrations of the other oxalate species in equilibrium by multiplying this number by ckq, ai, and 0 2 for oxalic acid at 0.0010 M 

Since the solution is unbuffered, perform an iterative calculation to correct for the protons consumed. 

We may solve the multiple equilibrium problem as well by using the systematic The systematic approach is well approaches described in Chapter 6, using the equilibrium constant expressions, the suited for competing equilibria mass balance expressions, and the charge balance expression. calculations. 

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