3 years ago

Select the correct answer.

2 answers:

4 0

D.) black text on a yellow background. There is much more contrast in the colors black and yellow than the other choices.

Igoryamba3 years ago

4 0

D black text on yellow background

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What is the pH of 0.10 M NaF(aq). The Ka of HF is 6.8 x 10-4

dsp73

Given information:

Concentration of NaF = 0.10 M

Ka of HF = 6.8*10⁻⁴

To determine:

pH of 0.1 M NaF

Explanation:

NaF (aq) ↔ Na+ (aq) + F-(aq)

[Na+] = [F-] = 0.10 M

F- will then react with water in the solution as follows:

F- + H2O ↔ HF + OH-

Kb = [OH-][HF]/[F-]

Kw/Ka = [OH-][HF]/[F-]

At equilibrium: [OH-]=[HF] = x and [F-] = 0.1 - x

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x = [OH-] = 1.21*10⁻⁶ M

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pH = 14 - pOH = 14-5.92 = 8.08

Ans: (b)

pH of 0.10 M NaF is 8.08

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