A 0.512 g sample of CaCO3 is dissolved in 12 M HCl and the mixture is diluted to 250 mL. A small amount of MgCl2 solution is added to a 25 mL aliquot of the solution., and the mixture is titrated with (ethylenediaminetetraacetic acid) EDTA to the Eriachrome Black T (with MgCl2 is used as indicator) end point. The mixed solution requires 28.55 mL of the EDTA solution to reach the end point. A similar amount of MgCl2 solution requires 2.60 mL to reach the endpoint.A 100-mL sample of hard water is titrated with 22.4 mL of the EDTA solution created above. The same amount of MgCl2 is added as previously and the total volume of EDTA solution required is 22.44 mL.a) What volume of EDTA is used in titrating the Ca2+ in the hard water?b) How many moles of EDTA are there in that volume?c) How many moles of Ca2+ are in 100 mL of water?

Given: 1 equivalent Mg2+ and 1 equivalent Ca2+ reacts with 1 equivalent EDTA. Total volume of EDTA…

Answered: A 0.512 g sample of CaCO3 is dissolved…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A 0.512 g sample of CaCO₃ is dissolved in 12 M HCl and the mixture is diluted to 250 mL. A small amount of MgCl₂ solution is added to a 25 mL aliquot of the solution., and the mixture is titrated with (ethylenediaminetetraacetic acid) EDTA to the Eriachrome Black T (with MgCl₂ is used as indicator) end point. The mixed solution requires 28.55 mL of the EDTA solution to reach the end point. A similar amount of MgCl₂ solution requires 2.60 mL to reach the endpoint.

A 100-mL sample of hard water is titrated with 22.4 mL of the EDTA solution created above. The same amount of MgCl₂ is added as previously and the total volume of EDTA solution required is 22.44 mL.

a) What volume of EDTA is used in titrating the Ca²⁺ in the hard water?

b) How many moles of EDTA are there in that volume?

c) How many moles of Ca²⁺ are in 100 mL of water?

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