Answered: Calcium fluoride is considered as a…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Calcium fluoride is considered as a relatively insoluble compound and therefore lime or slaked
lime has been considered as a possible material to remove excess fluoride in water of boreholes
in certain parts of the country. The solubility product of CaF2 is Ksp = 3 x 10 – 11 and that of
Ca(OH)2 is Ksp = 8 x 10 – 6 .
(i) What is the solubility of CaF2 and Ca(OH)2? (consider concentrations at equilibrium)
(ii) How much lime can be added to the water to remove 10 mg of F- ion per litre of
borehole water?
(The atomic masses are Ca: 40.08; F: 19.00; O: 16; H: 1)

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