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miss Akunina [59]

3 years ago

15

Josh is studying pH calculations and tests a basic solution with a pH meter. He finds that the solution has a pH equal to 9.2. W

hat is the pOH of the solution? A) 2.5 B) 4.8 C) 9.6 D) 10.2

1 answer:

OleMash [197]3 years ago

5 0

POH is a measurement of the hydroxide concentration of a solution, and is calculated by 14 - pH. Therefore, your answer is B, 4.8.

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The pH of 0.1 M BH⁺ClO₄⁻ solution is <u>5.44</u>

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Also, water dissociation constant: $K_{w}$ = 1 × 10⁻¹⁴

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$\Rightarrow K_{a} = \frac{K_{w}}{K_{b}}$

$\Rightarrow K_{a} = \frac{1\times 10^{-14}}{1\times 10^{-4}} = 1\times 10^{-10}$

<em><u>Now, the acid dissociation reaction for the weak acid (BH⁺) and the initial concentration and concentration at equilibrium is given as:</u></em>

Reaction involved: BH⁺ + H₂O ⇌ B + H₃O+

Initial: 0.1 M x x

Change: -x +x +x

Equilibrium: 0.1 - x x x

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$\Rightarrow 1\times 10^{-10} = \frac{x^{2}}{0.1 - x}$

$As, x$

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$\Rightarrow x = \sqrt{1\times 10^{-11}} = 3.16 \times 10^{-6}$

<u>Therefore, the concentration of hydrogen ion: x = 3.6 × 10⁻⁶ M</u>

Now, pH = - ㏒ [H⁺] = - ㏒ (3.6 × 10⁻⁶ M) = 5.44

<u>Therefore, the pH of 0.1 M BH⁺ClO₄⁻ solution is 5.44</u>

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