Compound K has a pH of 9.67. It is a water-soluble solid at room temperature wit

Question

Compound K has a pH of 9.67. It is a water-soluble solid at room temperature with a molecular weight of 95.675 g/mol. Is Compound K a strong acid, a weak acid, strong base, weak base, none of these, or cannot be determined? Describe an experiment or series of experiments that you could perform in the laboratory to determine if Compound K is a strong acid, weak acid, strong base, weak base, or none of these? State what you would do, what you would measure, and how you would decide the nature of Compound K.

Explanation / Answer

14)

a) Since the pH of the compound K is greater than 7, hence the compound will be basic in nature

The compound K will be weak base since the pH of strong bases are generally more than 10

b) In order to prove that compound is weak base, we can react it with same equivalents of strong acid

K + Strong acid (HCl) ----- Salt + Water (the pH of this mixture will be less than 7, hence the compound reacted is a weak base)

Another reaction

K + Weak base(NH3) --- there will be no reaction

K + CH3COOH ---- salt + water, pH will be almost neutral since it will be a reaction of weak base and weak acid

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