I\'m sorry that some of the numbers came out blurry. For clarification: CaCo3 is

Question

I'm sorry that some of the numbers came out blurry. For clarification: CaCo3 is the chemical in the beginning in the question and part a. ca2+ is part b and c

Name Prelaboratory Assignment Determination of the inundness of water and the mixture is diluted to 250 ml is dissolved m 12 M me usual'' b) What is the [Ca 1in the 250 ml. sahutioa? of the 250 mL solu 2. A small amount of MoCizsolutionis added to a 25 mL aliquot ofthe sahution in problem Land he mixture is titrated with EDTA to the Eriachrome Hinck I crud point The mixed solutian requires

Explanation / Answer

m = 0.512 g of CaCO3

M = 12 M of HCl

V = 250 mL...

a)

mol es of CaC3 used...

CaCO3 molar mass = 1/100.0869 = 0.009991

moles of CaCO3 = 0.009991

b)

[Ca+2] in V = 250 mL...

si

[Ca+2] = mol of Ca+2 / Total V in liters...

V = 250 mL = 0.25L so

[Ca+2] = 0.009991 / 0.25 = 0.039964

c)

moles of CA+2 are in 25 mL of sample...

ratio is 25/250 = 1/10 i.e. 10% of original sample

so

0.009991 *1/10

0.0009991 moles of Ca+2

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