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Homework Help: Zeolite Analysis! (stuck on ions)

  1. Jul 11, 2008 #1


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    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!
  2. jcsd
  3. Jul 12, 2008 #2


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    nm i got it :)
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