67) The solubility of an ionic compound MzX3 (molar mass 288 g) is 2.88 compound
ID: 1027582 • Letter: 6
Question
67) The solubility of an ionic compound MzX3 (molar mass 288 g) is 2.88 compound? 102 g/L. What is Ksp for the 68) Water containing Ca and Mg2 ions is called hard water and is unsuitable for some household and industrial use because these ions react with soap to form insoluble salts, or curds. One way to remove the Ca2 ions from, hard water is by adding washing soda (Na2CO3·10H20). (a) The molar solubility of CaCO3 is 9.3x 10 M. What is its molar solubility in a 0.050 M Na COs solution? (b) Why are Mg ions not removed by this procedure? (c) The Mg ions are removed as Mg(OH)2 by adding slaked lime [Ca(OH)2] to the water to produce a saturated solution. Calculate the pH of a saturated Ca(OH)2 solution. (d) What is the concentration of Mg2 ions at this pH? (e) In general, which ion (Ca or Mg) would you remove first? Why? 69) A volume of 75 mL of 0.060 M NaF is mixed with 25 mL of 0.15 M Sr(NO3)2. Calculate the concentrations in the final solution of NO, Na", Sr", and F . (Ksp for SrF, = 2.0 × 10-10.)Explanation / Answer
67)
Solution:- 2.88 x 10^-2 / 288 g/mol = 1 x 10^-4 mol
M = 1 x 10^-4
M2X3 <---> 2 M3+ + 3X2-
Ksp = (2x)^2 ( 3x)^3 =108 ( 1 x 10^-4)^5
=1.08x 10^-18
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