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Calculate the temporary and permanent hardness of water sample containing Mg(HCO3)2= 7.3mg/L, Ca(HCO3)2= 16.2mg/L, MgC12= 9.5mg/L, CaSO4=13.6mg/L)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter13: Titrations In Analytical Chemistry

Section: Chapter Questions

Problem 13.11QAP

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Question

Calculate the temporary and
permanent hardness of water
sample containing Mg(HCO3)2=
7.3mg/L, Ca(HCO3)2= 16.2mg/L,
MgC12= 9.5mg/L, CaSO4=13.6mg/L).

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Analysis of a given water sample gave the following results: Ca(HCO3)2 = 40.5 ppm, Mg(HCO3)2 = 36.5 ppm, MgSO4= 30 ppm, CaSO4 = 34 ppm, CaCl₂ = 27.75 ppm and NaCl = 10 ppm. a) Give values of temporary and permanent hardness in ppm CaCO3 equivalent and ° Clark. b) Calculate the amount of lime and soda used for softening 20,000 L of water. Given purity of lime is 84% and purity of soda is 92%. c) Calculate the volume of 0.01 (M) EDTA required to titrate 10 mL of same water sample using EBT as indicator. d) The hardness of 15,000 L of above water sample was completely removed by passing it through a zeolite softener. The zeolite softener required 100 L of NaCl solution for regeneration. Calculate the concentration of the NaCl solution.
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