First slide

PH scale, PH of strong acids and strong bases

Question

The correct order of increasing [H₃O⁺] in the aqueous solution is

Moderate

A

0.01 M H₂S < 0.01 M H₂SO₄ < 0.01 M NaCl < 0.01 M NaNO₂
B

0.01 M NaCl < 0.01 M NaNO₂ < 0.01 M H₂S < 0.01 M H₂SO₄
C

0.01 M NaNO₂ < 0.01 M NaCl < 0.01 M H₂S < 0.01 M H₂SO₄
D

0.01 M H₂S < 0.01 M NaNO₂ < 0.01 M NaCl < 0.01 M H₂SO₄

Solution

H₂SO₄ is a strong acid and H₂S is a weak dibasic acid.
H₂S is a weak acid, its p^H is less than 7 but greater than that of H₂SO₄.
NaCl is a neutral salt of strong acid and strong base. Such a salt solution has a P^H = 7
NaNO₂ is a salt of strong base (NaOH) and weak acid (HNO₂). Such a salt solution has a p^H > 7
$P^{H} = \frac{1}{2} [P^{K_{w}} + P^{K_{a}} + logC]$

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