1) Cr2O7^2- (aq) + NO2^-(aq) -> Cr^3+(aq) + NO3^-(aq) Whats the coefficient of water after balancing...

1) Cr2O7^2- (aq) + NO2^-(aq) -> Cr^3+(aq) + NO3^-(aq)

Whats the coefficient of water after balancing redox rxn, which in acidic solution?

2) Which solution will increase molar solubility of CuCO3 (Ksp=2.3*10^-10) at 298K? (Ksp of Cu(OH)2 is 2.2*10^-20)

HCl, NaOH, Na2CO3

I seriously have no idea with this problem please explain with details thank you so much

Solutions

Expert Solution

1) The initial reactant is acidic in nature. The balanced equation and explanation is given below.

2) The CuCO₃ is basic in nature.

The solubility product of copper hydroxide is less when compared to the solubility product of CuCO_3. Therefore the addition of NaOH will further decrease the solubility of CuCO_3.

CuCO₃Cu²⁺ + CO₃^2-

The addition of Na₂CO₃ will produce more CO₃^2- ions, so to balance the above equation the equilibrium will shift towards the right hand side producing more copper ions. Thus increasing the solubility of CuCO_3.

As stated above the CuCO₃ is basic in nature. Therefore creating acidic medium will increase the solubility of the CuCO_3.

queen_honey_blossom answered 1 year ago

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