Question

What happens to the solubility of CaF2 in water if 0.1 M HNO3 is added to the solution at 298 K? (Ksp = 4.0 x 10−11)

A. The solubility increases.

B.The solubility decreases.

C.The solubility is not affected.

Answer 1

October 2019 44th Week • 302-063 We at 298k. Page 1 are given with Cafe in water - Ksp= 4.0 x10-1) happens if olM HNO sol is 09.00 what added to it. 10.00 this value 11.00 As we are given with Ksp=4.0x15 is very low. Kopi solubility product constant 13.00 This is defined for equilibriun between a solids and its respective lins in a solution. woon Its ralue indicates the degree to which a compound dissociates in water. The higher the solubility product constant, The more soluble is compound 17.00 The Ksp value of Cafo at 298 which is yox10' indicates that cafe is very less soluble in water. Chemical equation for Cafe: - - Caf (s) Ca (aq) + 2 O paa) 18.00 PRIORITY APPOINTMENTS NOTES Caf, is slightly soluble iconic compound and in solution, we have a saturated solution consisting of Cat2 and f anions. OCT 2019 T 1 W 2 T 3 F 4 S 5 S 6 M 7 T 8 W 9 T 10 F S S M 11 12 13 14 T W 15 16 T 17 F S S M T W T F S S M T W 18 19 20 21 22 23 24 25 26 27 28 29 30 UN 28 29 30 31

2019 October 44th Week 303-062 - Page 2 on addition of OM HNO, : - since we are adding an acid that will act as proton donor ire Ht donos. me of As a result Cat solh will dissolve this some addition of the of OIM HNO, to Calcium flouride 1.00 what actually happened - as we have added acid, we have decreased the pH 3.00 and as a result cat, was dissolved. Therefore an inerease in solubility will be wa observed 15.00 a I Present insoth HO + HO - H₂O Car-) 18.00 from HNO present in solu 24₂04 (aq) + arran) ? 2HF 199.) + 2H₂O (listo acts as acid alts as base proton donos acts ay proton acceptor APPOINTMENTS PRIORITY M T W W F T S S T M W T T F S S NON F 18 19 20 21 22 23 24 25 26 27 28 29 30 SS M T W T F T F S S W T F S S 14 15 16 17 M T W 11 12 13

I October 31 H 2019 44th Week 304-061 Page ☺ 08.00 since their fluoride lins concentration are will reacting with Hot hence decrease in the sol 09.00 - According to le-chatelier's Principle a system 10.00 disturbed from equilibrium will shift its equilibrium to relieve the applied stress. so, here 11.00, the stress is decreased concentration of one of the products and hence the equilibrium shifts to make more of the products and there for more calcium fluoride dissolves. more 13.00 Here solubility of Cata increases. 14.00 15.00 Overall Reaction :- CaF2 (s) - 2H₂O + 2F fqq.) Carcas tafla9.) 2 QHf (aq) + Q Hooll) 16.00 17.00 How Cafe (9) + 216 0% z catifaq) + 2Hf (aq) +2130 ( PRIORITY APPOINTMENTS NOTES O CT 2019 T 1 W 2 T 3 F 4 S 5 S 6 M 7 T 8 W 9 T F S S M T W T F S S M T W T F S S M T 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 M S T T W