SOLUTION TO THE 19TH MAY 2020 QUIZ QUESTION BY CATALYST.

*SOLUTIONS TO THE MAY 19TH 2020 CATALYST ONLINE QUIZ QUESTIONS*…ππΌππΌππΌ

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NUMBER  ONE…ππΌ

Another name for water (H2O) is hydrogen oxide

The conjugate acid of water is H3O^+

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NUMBER  TWO…ππΌ

ANSWERππΌ ππΌ water must be present.

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NUMBER THREE…ππΌ

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NUMBER  FOUR…ππΌ

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NUMBER FIVE…ππΌ

The compound give is Al2O3.

First, we dissociate it (breaking it up)..ππΌ

Al2O3 —> *2Al^Β³+*  + *3(O^Β²β)*

The product of the concentrations of the ions is equal to the Ksp.ππΌππΌ

Ksp = [2Al^Β³+]Β²  x  [3O^Β²β]Β³

Now replace each ion with letter “S” which means solubility of the substance.

ThereforeππΌ

Ksp = [2S]Β² . [3S]Β³

Opening up the bracket, we haveππΌ

Ksp = 2Β².SΒ² . 3Β³. SΒ³

Ksp = 4 . SΒ² . 27 . SΒ³

Joining the like terms together, we haveππΌππΌππΌ

Ksp = (4 x 27) x (S^2+3)

Therefore…ππΌππΌππΌ

Ksp = 108S^5

NOTE THAT…ππΌ

Letter “S” stands for SOLUBILITY.

Then making solubility subject of formula, we have ππΌ

S^5 = Ksp/108

Therefore,

S = fifth root of(Ksp/108)

Let’s now substitute the Ksp value given to us the questionππΌ

SOLUBILITY = fifth root of (8.83×10^Β³β/108)

SOLUBILITY = fifth root of(0.000082)

ThereforeππΌ

SOLUBILITY = 0.152β

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