Ca(OH)2 is only partially soluble in water: Cs(OH)2<-->Ca^+2+ 2OH-. In which way
ID: 882484 • Letter: C
Question
Ca(OH)2 is only partially soluble in water: Cs(OH)2<-->Ca^+2+ 2OH-. In which way will the equilibrium shift (left or right) if you: A. Add Ca(NO3)2? Add NaOH? Add HCL? Ca(OH)2 is only partially soluble in water: Cs(OH)2<-->Ca^+2+ 2OH-. In which way will the equilibrium shift (left or right) if you: A. Add Ca(NO3)2? Add NaOH? Add HCL? Ca(OH)2 is only partially soluble in water: Cs(OH)2<-->Ca^+2+ 2OH-. In which way will the equilibrium shift (left or right) if you: A. Add Ca(NO3)2? Add NaOH? Add HCL?Explanation / Answer
Ca(OH)2 --> Ca+2+ 2OH-
a) on addion of Ca(NO3)2:
Ca(NO3)2 will dissocate as
Ca(NO3)2 --> Ca+2 + 2NO3-
So it will increase calcium ion concentration in the solution. Due to common ion effect it will decrease the solubility of calcium hydroxide as equilibrium will shift in such a way so that it may nullify the effect of change .
The concentraiton of calcium ion will decrease when equilibrium will shift backwards direction( left)
b) NaOH
The hydroxide ion will be produced by dissociation of NaOH.
So it will increase hydroxide ion concentration in the solution. Due to common ion effect it will decrease the solubility of calcium hydroxide as equilibrium will shift in such a way so that it may nullify the effect of change .
The concentraiton of calcium ion will decrease when equilibrium will shift backwards direction( left)
c) Add HCl : HCl will dissciate into H+
the H+ will react with OH- of calcium hydroxide, so will decrease hydroxide ion concentration in the solution. it will increase the solubility of calcium hydroxide as equilibrium will shift in such a way so that it may nullify the effect of change .
The concentraiton of hydroxide ion will increase when equilibrium will shift forward direction( right).