Saved Bookmarks
| 1. |
Derive the equation of following sparingly soluble salt. (a)Two ions having MX formula (b)Three ions having MX_2 or M_2X types salts (c) Four ions having AX_3 or A_3X type salts . (d)Five ions A_2X_3 or A_3X_2 type salts. |
|
Answer» Solution :(a)Examples of salts form by two ions and its `K_(sp)` : Example :`AgBr , AgCl , BaSO_4 , SrSO_4 , AlPO_4 , AgI, CaCO_3 , CaC_2O_4 , CaSO_4 ,SrSO_4, CdS, CuS , CuBr , CuCO_3 , FeCO_3 , FeO, CuO, ZnS , FES, HgSO_4, HgS, MgCO_3,MnCO_3, MnS, ZnCO_3 , NiS, PbCO_3, PbSO_4` etc. MX salts . `MX_((s))hArr M_((AQ))^(n+) + X_((aq))^(n-)` ....(Eq.-i) `K_(sp)=S^2`, where , n=1,2,3,..... (b)Example of sperigly soluble salts form by three ions and `K_(sp)`: `MX_2` type : `Mg(OH)_2 , BaF_2, Ca(OH)_2 , Zn(OH)_2 , SN(OH)_2 , Cd(OH)_2 , Fe(OH)_2 , MgF_2, Ni(OH)_2 , Pb(OH)_2` `M_2X` type : `Ag_2CO_3 , Ag_2CrO_4 , Ag_2Cr_2O_7, Ag_2SO_4 , Hg_2SO_4 , Hg_2S` etc. `{:("Equilibrium",MX_(2(s)) hArr, underset"SM"(M_((aq))^(2+))+,underset"2S M"(2X_((aq))^(-))),("Equilibrium",M_2X_((aq)) hArr, underset"2S"(2M_((aq))^(+))+, underset"S"(X_((aq))^(2-))):}}`...(Eq-ii) (c)Example of salts form by four ions and its `K_(sp)` : `MX_3 :Cr(OH)_3 , Al(OH)_3 , Fe(OH)_3, Bi(OH)_3 ` `M_3X : Ag_3PO_4 , Hg_3PO_4` `{:(MX_(3(s))hArr, underset"SM"(M_((aq))^(3+))+,underset"3SM"(3X_((aq))^(-))),(M_3X_((s)) hArr, underset"3S"(3M^+) +, underset"S"(X_(aq)^(3-))),(K_(sp)=,(3S)^3,(S)=27S^4):}}` ....(Eq.-iii) (d)Example of sparingly soluble salt form by five ions and its `K_(sp)` : `M_2X_3: Bi_2S_3 , Cr_2S_3 , Fe_2 S_3` `M_3X_2 : Zn_3(PO_4)_2, Cd_3(PO_4)_2 , Cu_3(PO_4)_2 , Mn_3(AsO_4)_2` `{:(M_2X_(3(s)) hArr, underset"2S"(2M_((aq))^(3+))+,underset"3S"(3X_((aq))^(2-))),(M_3X_(2(s)) hArr , underset"3S"(3M_((aq))^(2+))+,underset"2S"(2X_((aq))^(3-))),(K_(sp)= , (3S)^3 (2S)^2,=108S^5):}` |
|