A chemical reaction is a process by which the reactants are converted to the pro

Question

A chemical reaction is a process by which the reactants are converted to the products. A chemical equation describes the corresponding chemical reaction with the reactants on the left side and the products on the right side, separated by an arrow. A balanced chemical equation contains the same number of atoms for each element on both sides. The numbers written in front of the reactants and products are called stoichiometric coefficients, which specify the molar relationships between reactants and products in a balanced chemical reaction.

For the balanced chemical reaction of EDTA titration Mn+ + y4? ? MYn?4, all metal-EDTA complexes (MYn?4) follow a 1:1 molar ratio between metal ions (Mn+) and EDTA (y4?). In other words, 1 mole of metal ions reacts with 1 mole of EDTA to form 1 mole of metal-EDTA complexes. The number of moles of a compound in solution is equal to its concentration (in this case molarity or mol/L) times the volume of the solution.

Mole number (mol) = Molarity (mol/L)

Explanation / Answer

Concentration of EDTA =0.05 mol/L Volume of EDTA = 10.4ml. Volume of cacl2=25ml.   

Concentration of Ca ion=0.05x25/10.14 =0.1232mol/L

Converting to grams, 0.1232mol/Lx40.08g/mol =4.9378g/L

Since density=1,1Lwater=1000g water, to convert to ppm we need to multiply with 106

=4.9378g/1000gx106=4937ppm

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