Do You Understand? 1. What is the pH of a solution that is 1.45 M in HNO, and 0.

Question

Do You Understand? 1. What is the pH of a solution that is 1.45 M in HNO, and 0.75 in KNO,? The K, for HNO2 4.60 x 10 PH 2. A 100.00 mL volumetric flask is loaded with 1.75 grams of NaF. To this was added 28.5 mL of a 4.00 M solution of HF When this flask is filled to the mark and shaken to ensure complete mixing, what is the pH of the firal solution? The Ka for HF . 3.5 × 104. pH - 3. We wish to prepare a solution of acetic acid (CH COOH) with a pH controlled by the addition of the salt, CH COONa. How many grams of CH COONa must be used to form 240.0 mL of a solution that is 0.860 M in acetic acid if the desired final pH = 2.797 The K, for CH,COOH-1.80 x 104, grams of CHyCOONa needed

Explanation / Answer

Q1

this is a buffer

NO2- and HNO2 are present

so

pH = pKa + log(NO2-/HNO2)

pKa = -log(Ka) = -log(4.6*10^-4) = 3.34

pH = 3.34 + log(0.75/1.45)

pH = 3.0536

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