Solution: Sodium tripolyphosphate (Na5P3O10) is used in many

Chapter 18, Problem 18.125

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Sodium tripolyphosphate (Na5P3O10) is used in many synthetic detergents. Its major effect is to soften the water by complexing Mg21 and Ca21 ions. It also increases the efficiency of surfactants, or wetting agents that lower a liquids surface tension. The pK value for the formation of MgP3O1032 is 28.60. The reaction is Mg21 1 P3O1052 34 MgP3O1032. Calculate the concentration of Mg21 in a solution that was originally 50. ppm Mg21 (50. mg/L of solution) after 40. g of Na5P3O10 is added to 1.0 L of the solution.

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