A buffer solution with a volume of 0.0230 L consists of 0.69 M hydrofluoric acid (HF), a weak acid, plus 0.69 M sodium fluoride (NaF). The acid dissociation constant of hydrofluoric acid, Ka, is 6.3âââ10â4. Determine the pH of the buffer solution after the addition of 0.0033 mol rubidium hydroxide (RbOH), a strong base. (Assume no change in solution volume.)

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16 Jun 2019

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You are asked to prepare a pH = 3.00 buffer solution starting from 1.25 L of a 1.00 M solution of hydrofluoric acid (HF) and any amount you need of sodium fluoride (NaF). (a) What is the pH of the hydrofluoric acid solution prior to adding sodium fluoride? (b) How many grams of sodium fluoride should be added to prepare the buffer solution? Neglect the small volume change that occurs when the sodium fluoride is added.

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You are asked to prepare a pH=3.00 buffer solution starting from 1.25 L of a 1.00M solution of hydrofluoric acid (HF) and an excess of sodium fluoride (NaF).

What is the pH of the hydrofluoric acid solution prior to adding sodium fluoride?

How many grams of sodium fluoride should be added to prepare the buffer solution? Neglect the small volume change that occurs when the sodium fluoride is added.

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