1. The problem statement, all variables and given/known data Firstly, I have done the bulk of the lab but me and my lab partner cannot determine somethings and we are confused! - Calculating the mmole of Ca2+ ion present in each sample titration In titration #1 the beaker contained 1.00ml .15 M CaCl2 stock solution (with EDTA Buffer and Indicator). The Volume of EDTA titrated was 22.60 ml. In titration #2 we had a 1.00ml (2g zeolite/50ml CaCL2) filtrate solution (with EDTA Buffer and Indicator). The Volume of EDTA titrated was 18.4 ml. Then the second question is how do we calculate the mmole of Ca2+ exchanged by zeolite and also in per gram zeolite used! (General directions would help so much) 2. Relevant equations 2NaAlO2 + 2Na2SiO3 ∙ 5H2O → Na2Al2Si2O8 + 4.5H2O + 4NaOH + 3.5H2O 3. The attempt at a solution We found the initial mmole of Ca2+ but we do not know how to fit in the titration data. We did .15 mol X .001L =.00015 M x 1000ml/L = .15 mmol/Ca2+ If anyone could clue us in the correct direction that would be great!