Question

Rank the following bases by their [OH]upon dissociation in water. List the solution with greatest [OH]...

Rank the following bases by their [OH]upon dissociation in water. List the solution with greatest [OH] at the top and the lowest at the bottom.

0.001 M Ca(OH)2

0.001M KOH

0.001 M (CH3CH2)2NH

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Answer #1

0.001 M Ca(OH)2

0.001M KOH

0.001 M (CH3CH2)2NH

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Ca(OH)2 is a strong base. It completely ionized in water. Each Ca(OH)2 molecule will give 2 OH- in solution.

Thus, 0.001 M Ca(OH)2 will liberate 0.002 M OH-.

KOH is a strong base. It completely ionized in water. Each KOH molecule will give 1 OH- in solution.

Hence, 0.001 M KOH will liberate 0.001 M OH-.

(CH3CH2)2NH is a weak base. It will partially ionize in water depending on its pKb value.

Therefore, 0.001 M (CH3CH2)2NH will liberate <0.001 M OH-.

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