In the lime soda process once used in large scale municipalwater softening, calcium hydroxide prepared from limeand sodium carbonate are added to precipitate Ca2+ asCaCO3 (s) and Mg2+ as Mg(OH)2 (s):Ca2+(aq) + CO32-(aq)---->CaCO3(s)Mg2+(aq) + 2 OH-(aq)----->MgOH2 (aq)How many moles of Ca(OH)2 and Na2CO3 should be addedto soften (remove the Ca2+ and Mg2+) 1200 L of water in which[Ca2+] = 5.0 x 10-4 M and[Mg2+] = 7.0 x 10-4 M?

The balanced chemical equations are,

Answered: In the lime soda process once used in…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 12.52PAE: Because barium sulfate is opaque to X-rays, it is suspended in water and taken internally to make...

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In the lime soda process once used in large scale municipal
water softening, calcium hydroxide prepared from lime
and sodium carbonate are added to precipitate Ca2+ as
CaCO_3⁽s) and Mg²⁺ as Mg(OH)₂ (s):

Ca²⁺(aq) + CO₃^2-(aq)---->CaCO₃(s)
Mg²⁺(aq) + 2 OH^-(aq)----->MgOH₂ (aq)
How many moles of Ca(OH)₂ and Na₂CO₃ should be added
to soften (remove the Ca²⁺ and Mg²⁺) 1200 L of water in which
[Ca²⁺] = 5.0 x 10^-4 M and
[Mg²⁺] = 7.0 x 10^-4 M?

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