Answer to Question #289319 in General Chemistry for gus

Question

Water hardness is caused by the presence of Ca2+ and Mg2+ ions. One way of

removing these ions is to add sodium carbonate, Na2CO3(s), which causes

precipitation of calcium carbonate, CaCO3(s), and magnesium carbonate,

MgCO3(s). A 5.0 L volume of water has a Ca2+ concentration of 0.0040 mol/L.

What is the maximum mass of sodium carbonate that can be added to this

volume without causing any precipitate to form? The Ksp for CaCO3(s) is 4.8x10-9

at 25 oC.

Answer 1

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