Question

For each of the salts on the left, match the salts on the right that can be compared directly, using Ksp values, to estimate solubilities. For ear (If more than one salt on the right can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e.g, ABC.) 1. zinc sulfide 2. lead chloride A. CaCO3 B. Zn(CN)2 C. BaF2 D. Ag3PO4 Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water. zinc sulfide lead chloride Esp sp Note: Multiply out any number and put it first in the expression. Combine all exponents for

Answer 1

Q1 ) zinc Sulphide (zn) ZnS nt+s Ksp [ant] (5) kap : s2 1 assuming solubility = 5 ii) Lead chloride (Pbela) Pbel I pbt2 + 2et Ksp = [P6+2] [cc] ² Ksp = 5/22 [25, because 2ctions) Ksp = 483 A) CaCO3 Cacoz I Cat² + come Ksp [cat2 (0:2) = ksp - 52 in B) Zn (CN) znkN), - Zuth + 2N Ksp = [ Zyt?][ en ]? ksp - 3(25) ² - 453

c.) BaF2 Barr - Bat?+ 2F Ksp : [Bat] [] » Ksp = $(25)2 - 453 —D:) A93P04 pa Ag3P04 = 3A9++ POG Ksp = [ag+I' [POZ] ksp - (35)35 2-754 By observing the above results, 10)ms šowbauty product 1 - AL 2 Pb c solubility product 2 ~ BCL Equations (1) ¢ © gives the expressions for ksp of salts in terms of solubility "S" Q.2) A) AGOH D.) Fe(OH)2 Ag OH = A9 +0H Fe(OH)2 7 Fe + 2011 - Ksp = 1 Ag + ][OHJ _Ksp = [fe+2) Cou)? Ksp = 32 = 5/252 B-) Ag2 3 ksp : 453 Ags 2 Agt +5² Ksp = [Agt ² [52] cobalt (T) hydroxide => Ksp = (2595 = 4s? | co(OH)2 = C09+2017 c.) Nis Rsp = (60927601]2 Nis ² Nith+52 = 5(25)2 Ksp = [Ni +2] [52] > ksp = 5

without any calculations, 1) Cocot), is more souble than "AC" corresponding to AGOH & Nis a sea It is not possible to determine whether CO(OH)2 is more or less soluble than "B" (corresponding to Ago S f Fecot), ) by simply comparing ksp Values As "S" value is not known 1) COCOH)₂ is less soluble than none of the AB, Cand D on observation of Ksp values an