He table below lists some acids and bases. Strong acids Weak acids Weak bases Strong bases HBr CH3COOH NH3 NaOH HNO3 HCOOH NH4OH KOH H2SO4 Ca(OH)2 Which salt has a pH < 7?

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Question:

He table below lists some acids and bases. Strong acids Weak acids Weak bases Strong bases HBr CH3COOH NH3 NaOH HNO3 HCOOH NH4OH KOH H2SO4 Ca(OH)2 Which salt has a pH < 7? A) KBr B) HCOOK C) CaSO4 D) NH4NO3

Answer:

Answer : Option D)

Explanation :

Amongst the given list of acids and bases, following are the strong acids and weak acids

Strong Acid: HBr, and

Weak Acid: and HCOOH

And strong bases with weak bases are given below;

Strong Base: NaOH, KOH and

Weak Base: and

Now, Acid  + Base    →    Salt   + Water

so, the salt of strong acid and weak base which will have pH < 7

will be

because of the following acid base reaction (neutralization reaction)

    +         ↔        +    

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