_____ occurs when the product of the ion concentrations exceeds the Ksp.
2 answers:
Answer : Precipitation occurs when the product of the ion concentrations exceeds the .
Explanation :
Ionic product : It is the product of the concentrations of the ions in solution raised to the same power by its stoichiometric coefficient in a solution of a salt. This takes place at any concentration. The ionic product is represented as, Q.
Solubility product constant : It is defined as the product of the concentration of the ions present in a solution raised to the power by its stoichiometric coefficient in a solution of a salt. This takes place at equilibrium only. The solubility product constant is represented as, .
There are three cases for the solubility :
- When
this means that the solution is unsaturated solution and more solid will be dissolve.
- When
this means that the solution is saturated solution.
- When
this means that the solution is supersaturated solution and solid will be precipitate.
Hence, the precipitation occurs when the product of the ion concentrations exceeds the .
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Answer:
The standard enthalpy of formation of methanol is, -238.7 kJ/mole
Explanation:
The formation reaction of CH_3OH will be,
The intermediate balanced chemical reaction will be,
..[1]
..[2]
..[3]
Now we will reverse the reaction 3, multiply reaction 2 by 2 then adding all the equations, Using Hess's law:
We get :
..[1]
..[2]
[3]
The expression for enthalpy of formation of will be,
The standard enthalpy of formation of methanol is, -238.7 kJ/mole