(oH), solution is 12-22. What is the concentration of the BaloH2 solution The pH

Question

(oH), solution is 12-22. What is the concentration of the BaloH2 solution The pH of a Problem II: Weak Acids & Buffers l1] ne the pH and ionization of 0.65 M solution of nitrouws acid, (HNO2, pKa 3.40) (b) 3ilonization (2 pointe/ 12u You need to produce a buffer with pH-420 by dissolving a weighed amount of sodium hypochlorite (NaNO2) in 500- mL of 0.65-M benzoic acid Apoints each, (a) What mass of sodium nitrite is required (sodium nitrite has a molar mass of 69.00 e/mo). (b) What is the resulting pH if 4s mu of 0.18 M Hais added to 250 mL your buffer?

Explanation / Answer

1. a

HNO2 <==> H+ + NO2^-

pka = 3.4

Ka = 10^-3.4 = 3.98*10^-4

Ka= x*x/0.65-x

or, 3.98*10^-4 = x*x/0.65-x

or, 2.59*10^-4 - 3.98x*10^-4 - x^2 = 0

or, x =0.016 M

[H+] = 0.016 M

pH = 1.79

% ionization = (0.016/0.65) *100 % = 2.46 %

HNO2 H+ NO2- initial 0.65 0 0 change -x +x +x equilibrium 0.65-x x x

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.