chemistry

posted by william

We can determine the content (%) of calcium in milk through complexometric analysis by titration with EDTA. If we weigh 0.50 g of milk powder and titrate with EDTA 0.010 mol/L. What percentage of Ca2+does the milk if expended EDTA was 13.6 ml?

  1. DrBob222

    millimols Ca = mL EDTA x M EDTA = ?
    grams Ca = mols Ca x atomic mas Ca = ?
    % w/w = (grams Ca/mass sample)*100 = ?

  2. william

    * Calculation of the quantity in moles of CA2 +:
    V (EDTA) L * M (EDTA) = > 0.0136 * 0.010 = > 0.000136 moles CA2 +
    * Calculation of the quantity in grams of Ca2 +:
    Moles Ca2 + * atomic mass Ca 0.000136 * 40.078 = > 0.00545 g
    Finally, percentage (%) of Ca2 +:
    % = (mass g Ca2 +/sample) * 100
    % = (0.00545/0.50) * 100
    % = 0.0109 * 100
    % = 1.09 g of CA2 +

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