A solution is made by combining 500 mL of .10 M HF with 300 mL of...

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A solution is made by combining 500 mL of .10 M HF with 300 mL of...

A solution is made by combining 500 mL of .10 M HF with 300 mL of .15 M NaF. What is the pH of the solution?

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Answer 1

Answer #1

What is the pH of the solution?

answer= 3.10

=========================================================

In Moles
i: HF(0.05)+F⁻(0.045)→F⁻(0)+HF(0)

c: (-0.045)+(-0.045)→(+0.045)+(0.045)

e: HF(0.005) →F⁻(0.045)+HF(0.045)

Using
[H₃O⁺]= [(Initial Acid)/(Conj. Base)] * Ka

[H₃O⁺]= [(0.05)/( 0.045)] * 7.2×10^-4==0.0008

pH = - log [0.0008]==3.0969 rounded to 3.10 --answer

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Answer 2

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