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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
In which of the following cases, $pH$ is greater than $7$?
  • A
    $50\, ml$ of $0.1\, M\, HCl + 50\, ml$ of $0.1\, M\, NaCl$
  • B
    $50\, ml$ of $0.1\, M\, H_2SO_4 + 50\, ml$ of $0.2\, M\, NaOH$
  • C
    $50\, ml$ of $0.1\, M\, CH_3COOH + 50\, ml$ of $0.1\, M\, KOH$
  • D
    $50\, ml$ of $0.1\, M\, HNO_3 + 50\, ml$ of $0.1\, M\, NH_3$
✓

Answer

$(a)$ $[{H_3}{O^ + }] = \frac{{0.1}}{2} = 0.05;$ $pH= -log\, 0.05 = 1.301$ 

$(b)$ Complete neutralization of strong acid and strong base, $pH = 7$.

$(c)$ Hydrolysis of the salt $CH_3COOK, pH > 7$ (salt of weak acid with strong base)

$(d)$ Hydrolysis of the salt $NH_4NO_3, pH < 7$ (salt of strong acid with weak base)

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