1. The problem statement, all variables and given/known data Write the charge balance for a solution containing H(+), OH(-), Ca^(2+). HCO3(-). CO3^(2-) , Ca(HCO3)+, Ca(OH)+, K+, and CIO4(-). 2. Relevant equations Also, I am having a trouble understanding the concepts of mass balance and charge balance. 3. The attempt at a solution The only thing I know to do is put the positive charges on one side and the negatives on the other, and then change the coefficients.