*SOLUTIONS TO THE MAY 19TH 2020 CATALYST ONLINE QUIZ QUESTIONS*…👇🏼👇🏼👇🏼
Another name for water (H2O) is hydrogen oxide
The conjugate acid of water is H3O^+
ANSWER👉🏼 👉🏼 water must be present.
ANSWER👉🏼👉🏼 A supersaturated solution.
The compound give is Al2O3.
First, we dissociate it (breaking it up)..👇🏼
Al2O3 —> *2Al^³+* + *3(O^²–)*
The product of the concentrations of the ions is equal to the Ksp.👇🏼👇🏼
Ksp = [2Al^³+]² x [3O^²–]³
Now replace each ion with letter “S” which means solubility of the substance.
Ksp = [2S]² . [3S]³
Opening up the bracket, we have👇🏼
Ksp = 2².S² . 3³. S³
Ksp = 4 . S² . 27 . S³
Joining the like terms together, we have👇🏼👇🏼👇🏼
Ksp = (4 x 27) x (S^2+3)
Ksp = 108S^5
Letter “S” stands for SOLUBILITY.
Then making solubility subject of formula, we have 👇🏼
S^5 = Ksp/108
S = fifth root of(Ksp/108)
Let’s now substitute the Ksp value given to us the question👇🏼
SOLUBILITY = fifth root of (8.83×10^³–/108)
SOLUBILITY = fifth root of(0.000082)
SOLUBILITY = 0.152✅
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