Predicted pH for salt solutions (1 M)
 Salt   pH
KCN

strong base, weak acid salt

K+ + H2O Equilibrium double arrow NR

CN- + H2O Equilibrium double arrow HCN + OH-

>7
KC2H3O2

 strong base, weak acid salt

K+ + H2O Equilibrium double arrow NR

C2H3O2- + H2O Equilibrium double arrow HC2H3O2 + OH-

>7
 NH4Cl

weak base, strong acid salt

NH4+ + H2O Equilibrium double arrow NH3 + H3O+

Cl- + H2O Equilibrium double arrow NR

<7
  NH4 NO3

weak base, strong acid salt

NH4+ + H2O Equilibrium double arrow NH3 + H3O+

NO3- + H2O Equilibrium double arrow NR

<7
 NH4CN

NH3 stronger than HCN

NH4+ + H2O Equilibrium double arrow NH3 + H3O+

CN- + H2O Equilibrium double arrow HCN + OH-

>7
NH4C2H3O2

pKb NH3 = pKa HC2H3O2 

NH4+ + H2O Equilibrium double arrow NH3 + H3O+

C2H3O2- + H2O Equilibrium double arrow HC2H3O2 + OH-

7

 

 


© R A Paselk

Last modified 6 May 2013