Question

In an aqueous solution, classify these compounds as strong acids, weak acids, strong bases, weak bases, or other. Strong acid Weak acid Strong base Weak base Other Answer Bank H, PO, HBr Ba(OH), Сн, соон | LIOH (CH, BN HNO, NH, NaCl

Answer 1

1. Sol :-

Strong acids :- H₃PO₄ , HBr and HNO₃

Weak acids :- CH₃COOH and HF

Strong bases :- Ba(OH)₂ and LiOH

Weak bases :- (CH₃)₃N and NH₃

Others :- NaCl (Neutral Salt)

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2. Sol :-

Because, HCl is the strong acid, therefore it is completely dissociated in aqueous solution to gives H⁺ and Cl^- ions.

So,

[HCl] = [H⁺] = 8.6 x 10^-8 M

As,

pH = - log [H⁺]

pH = - log 8.6 x 10^-8 M

pH = - (7.0655)

pH = 7.07

Hence, pH = 7.07

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3. Sol :-

Most acidic (pH<7) solution to most basic (pH>7) are :

[H⁺] = 1.0 x 10^-3 M > [OH^-] = 1.0 x 10^-9 M > pH = 7 > pH = 10

Explanation :-

1). [H⁺] = 1.0 x 10^-3 M

pH = - log [H⁺]

pH = - log 1.0 x 10^-3 M

pH = 3

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1). [OH^-] = 1.0 x 10^-9 M

pOH = - log [OH^-]

pOH = - log 1.0 x 10^-9 M

pOH = 9

pH + pOH = 14

So,

pH = 14 - pOH

pH = 14 - 9

pH = 5