Solubility

Question 1

Anions for which i)Solubility of 1A compounds generally increases when going from top to bottom
ii)Solubility of 2A compounds generally increases when going from top to bottom.

Answer 1

i) F , O , OH , CO3 , HCO3 , SO4 , SO3
ii) F , O , OH , C2O4

Question 2

Solubility order of Compounds of i) Anion C2O4 and IIA ii)Anion F and IIA iii)Anion OH and IIA

Answer 2

i)BeC2O4>BaC2O4>SrC2O4>CaC2O4>MgC2O4
ii)BeF2>BaF2>SrF2>CaF2>MgF2
iii)Be(OH)2<Mg(OH)2<Ca(OH)2<Sr(OH)2<Ba(OH)2

Question 3

What is the only white ppt which is Soluble in hot water ?

Answer 3

PbCl2

Question 4

Solubility order of i)AgCl,AgBr,AgI ii)Hg2Cl2,Hg2Br2,Hg2I2 iii) PbCl2,PbBr2,PbI2

Answer 4

i)AgCl>AgBr>AgI
ii) Hg2Cl2>Hg2Br2>Hg2I2
iii) PbCl2>PbBr2>PbI2
Solubility is indirectly proportional to polarising power for Heavy metal halides

Question 5

Cations with which the following anion make insoluble compounds
i)F-1
ii)NO-,CH3COO-
iii)Cl-,Br-,I-
iv)SO4 -2
v)CrO4 -2
vi)S2O3 -2

Answer 5

i)Mg+2,Pb+2,Sr+2,Ca+2
ii)Ag+,Cu +,Hg2 +2,
iii)Ag +,Cu +, Pb +2, Hg2 +2(HgI2 and BiI3 are also insoluble compounds)
iv)Hg +2,Sr + 2, Ba +2,Pb +2,
v)Ag +(red),Hg2 +2(red), Sr +2(yellow),Ba +2(yellow), Pb +2(yellow)
vi)Ag +,Bi +3,Cu +,[Ni(en)3] +2,Ba +2,Pb +2,Hg +2,Hg2 +2

Question 6

Cations with which the following anion make soluble compounds
i)CO3-2,SO-2,AsO4-3,PO4-3,OX -2
ii)CN-,S-2
iii)O-2,OH-1

Answer 6

i)NH4+,IA(FeC2O4 and BeC2O4 are also soluble compounds)
ii)NH4+,IA,2A(Hg(CN)2 is also a soluble compound)
iii)IA,NH4+,Ba +2,Sr +2,Ca +2