Home Forums Chemistry Identify the effect of increasing acidity on the solubility of the given compounds.

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  • #21017
    Shobhit Kumar
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      Identify the effect of increasing acidity on the solubility of the given compounds.

      1. ZnS
      2. MgCO3
      3. Ba(OH)2
      4. Ca3(PO4)2
      5. NiBr2
      6. CuI

      • This topic was modified 1 year, 11 months ago by ProtonsTalk.
      • This topic was modified 1 year, 11 months ago by ProtonsTalk.
      #21019
      ProtonsTalk
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        Firstly, we need to answer whether acidity affects solubility or not. And Le Châtelier’s Principle clearly states that pH does affect the solubility of a compound.

        Let us take every compound given above and address them one by one.

        ZnS

        ZnS is an ionic compound and dissociated into Zn2+ and S2- as shown below

        ZnS ⇋ Zn2+ + S2-

        Adding an acid to the solution means adding H+ ions basically which will lead to

        2H+ + S2- ⇋ H2S

        This reaction basically decreases the amount of S2- ions which in turn increases the solubility of ZnS, So,

        1. Increases Solubility


        MgCO3

        MgCO3 when dissolved goes through the following reaction

        MgCO3 ⇋ Mg2+ + CO32-

        Here we know that CO2-3 is a base. In water it will react as following

        CO32- + H2O ⇋ HCO3 + OH

        These two reaction will create the following equilibrium

        MgCO3 + H2O ⇋ Mg2+ + HCO3 + OH

        Making the solution more acidic means making the equilibrium towards the right which increases the solubility.

        2. Increases solubility.


        Ba(OH)2

        Ba(OH)2 as we know is a soluble base which dissociates as

        Ba(OH)2 ⇋ Ba2+(aq) + 2OH(aq)

        By adding acid, according to Le Châtelier’s Principle, the equilibrium will move forwards, increasing the solubility

        3. Increases solubility.


        Ca3(PO4)2

        This is similar to MgCO3. The equilibrium equation will be given by

        Ca3(PO4)2 + H2O ⇋ Ca2+ + HPO2-4 + OH

        On adding hydronium ions i.e acid, we will see increase in solubility here as well.

        4. Increases solubility.


        NiBr2

        This will have the same result as ZnS

        NiBr2 + H+ ⇋ Ni2+ + HBr

         5. Increases solubility.


        CuI

        The same reaction will happen in the compound upon the addition of H+ ions.

        CuI + H+ ⇋ Cu+ + HI

        And it will result in increased solubility.

         6. Increases solubility.

        • This reply was modified 1 year, 11 months ago by ProtonsTalk.
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