Please calculate the pH of a buffer solution

The Ka of lactic acid is 1.38 x 10^-4

Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 3.2–3.5 a - NaNO 2 / HNO 2 (K a = 4.5 × 10 –4) b - NaOCl / HOCl (K a = 3.2 × 10 –8) c - NaCl / HCl d - NH 3 / NH 4Cl (K a = 5.6 × 10 –10) e - CH 3COO 2Na / CH 3COOH (K a = 1.8 × 10 –5)

What is the pH of a buffer solution that is 0.13 M methylamine and 0.21 M methylammonium chloride? (Assume the value of Kw is 1.0  10-14.)

How do I complete problem 1 in a step by step?

1) Listen A 45.60-mL sample of a 0.476 M solution of acetic acid (HC2H3O2) which is a weak acid with an acid ionization constant of 1.70 X10-5 at 25°C is being titrated by a 0.652 M solution of NaOH which is a strong base. Calculate the pH when 60.00 mL of 0.652 M NaOH has been added. HC2H3O2(aq) + H2O(L) = C2H3O2 (aq) + H3O* (aq) 13.45 12.08 13.06 11.67 13.68 201591....docx LAB EXP. #3 -.docx Show All

Calculate the pH of a buffer solution containing 0.584 mol HA weak acid and 0.703 mol A- in 130.1 mL  after 0.158 g of NaOH was added? [Ka= 1.56 ×10-5] Report your answer with three decimals. Enter numbers only; do not enter units.

What is the pH of a buffer prepared by mixing 5.0 g of ammonia (NH3) and 20.0 g of ammonium chloride (NH4Cl) in enough water to form 2.50L of solution. The K, of ammonia is 1.76 x 10-5. How many moles of sodium hypobromite, NaBrO, should be added to 1.00 L of 0.050 M hypobromous acid, HBrO, to form a buffer solution of pH 8.80? Assume no volume change when the NaBr is added. K. of HBrO is 2.50 x 10.⁹ How many grams of sodium lactate, NaC3H5O3, should be added to 1.00L of 0.150M lactic acid, HC3H₂O3, to form a buffer solution with a pH of 3.90? Assume no volume change when the sodium lactate is added. K. of lactic acid is 1.40 x 10-4.

do both please as they are the part of the same question..

What is the pH of a buffer solution that is 0.602 M in hydrofluoric acid and is 0.455 M is potassium fluoride? The K₂ of hydrofluoric acid is 6.4 x 10-4. (Two decimal places)