Problem: Calculate the solubility of LaF3 in grams per liter in (a) pure water, (b) 0.010 M KF solution, (c) 0.050 M LaCl3 solution.

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We are being asked to determine the solubility of LaF3 in grams per liter in (a) pure water, (b) 0.010 M KF solution, (c) 0.050 M LaCl3 solution


Since the compounds is an ionic compound, it forms ions when dissociating in water. The dissociation of LaF3, KF and LaCl­­3 in water are as follows:


The fluoride ion, F, has a charge of –1. Lathanum then has a charge of +3:

 LaF3 (s)  La3+ (aq) + F- (aq)


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Calculate the solubility of LaF3 in grams per liter in (a) pure water, (b) 0.010 M KF solution, (c) 0.050 M LaCl3 solution.

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