Can you please answer and explain question 19? Thank you! :) 18. The solubility
ID: 570369 • Letter: C
Question
Can you please answer and explain question 19?Thank you! :) 18. The solubility equations and Kp values for two different chloride salts are shown below AgCl(s) = Ag.(aq) + cr(aa) K-= 1.6 x 10-10 What can be interpreted from this information? (A) The Kip of AgCl is so small that AgCl is completely insoluble. (C) With NaCi, the forward reaction is (D) With AgCl, the forward reaction is favored. The relatively small equilibrium constant tells us The Ksp of NaCI is so large that the reaction is not reversible. products are favored. products are favored. favored. The relatively large equilibrium constant tells us that the 19. The mineral fluorite is the main source of calcium fluoride. Caf, has a solubility of 2.2 x 10 M in pure water. Which is a correct explanation for what occurs when solid CaFz is rather than in pure water? (A) The solubility increases because HF is a weak acid. B) The solubility increases because HF is a strong acid. dissolved in an acidic solution, The solubility decreases because HF is a weak acid. The solubility decreases because HF is a strong acid. D)
Explanation / Answer
19)
The addition of acidic solution like HCl dissociates into H+ and Cl- ions in the solution.And F- forms from dissociation of CaF2 is a weak base , so it grab onto protons to form weak acid HF. This formation of HF effectively lowers the concentration of F- in solution, allowing more of CaF2 to dissolve into the solution because there are a lower amount of F- ions.
Therefore, the solubility increases because HF is a weak acid.
ie option A is the correct choice.