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Determining Concentration of a Compound when pH is Known

Dr M

We start with a 1 liter solution of water and a mild acid --- the pH of this solution is 4.0;

To this solution, we add 100 grams of Chemical A that has a pH of 10.89 and a molecular weight of 300 g/mol;

We then add 110 grams of Chemical B ---- Chemical B has a pH of 8.5 but its mol. wgt is unknown?

We then add precisely 51 grams of Chemical C to the solution --- Chemical C has a pH of 2.5 and a molecular wgt of 594 g/mol

The resultant pH of the entire solution mixture is 4.4 ---- determine the molecular weight of Chemical B???


Solution Summary

A calculation for pH form molecular masses and volumes of a mixture is shown.