A 100 mL sample of hard water is titrated with EDTA solution. The same amount of

Question

A 100 mL sample of hard water is titrated with EDTA solution. The same amount of Mg^2+ is added as previously, and the volume of EDTA required is 22.51ml.

a.what is the volume of EDTA used in titrating the Ca2+?

b.how many moles of EDTA are there in that volume?

c.how many moles of ca2+ are there in 100ml of water?

given data>>

0.0051 mol of CaCO3 used

0.0204M of Ca2+ in the 250ml of solution

0.0005 moles of Ca2+ in 25ml aliquot of the 0.0204M solution

26.05 ml of EDTA needed to titrate the Ca 2_ ion in the aliquote

0.0051 moles of EDTA in the volume

0.196M of the EDTA solution

Explanation / Answer

a)

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