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OpenStudy (anonymous):
An unknown solution water sample of 20.00ml requires 25.55ml of the above standardized EDTA solution for complete reaction what is the mass percent of ca2+ present in the sample assume the density of water is 1.00g/m Please help very urgent medals will be given !!!
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OpenStudy (cuanchi):
the soichiometry of the reaction is 1:1 Ca+2 + EDTA-4 ------> CaEDTA-2 You need to know the concentration of the bove standardized EDTA solution, and then use the V1C1=V2C2 to calculate the moles of Ca in your sample. Then you have to express your results as gCa/100g of water.
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