3. Apply the following information about the acid ionization constants: Ka, for

Question

3. Apply the following information about the acid ionization constants: Ka, for H2S is 1.0 x 10-7 and K for HS is 1.3 x 10-13 to predict whether NaHS (aq) is acidic, basic, or neutral. You must show the setup. Setup: Answer: NaHS is because (acidic, basic, or neutral) 4. Consider the following acid ionization constants: Which salt will hydrolyze more, KF (aq) or Koci (ag)? Setup: Write the equilibrium equations and calculate the K values. Ka for HF is 7.2 x 10-4 and Ka for HOCl is 3.5 x 10-8 will hydrolyze more, because Answer:- 5. Which salt is expected to hydrolyze more, NH40CI (aq) or NaOCI (ag)? Explain why. Answer:- will hydrolyze more, because -12-

Explanation / Answer

Q3

NaHS --> Na+ + HS-

HS- can act either acidic or basic

then, best way to predict is via pH; then

pH = 1/2*(pKa1+ pKa2)

pKa1 = -log(Ka!) = -log(10^-7) = 7

pKa2 = -log(1.3*10^-13) = 12.886

then

pH = 1/2*(7+12.89) = 9.95

this is basic,

HS- is likely to accept H+ from H2O to form H2S + OH-

Q4

hydrolysis -> requires strong basic behaviour

HF = stronger acid than HOCl

then,

OCl- = stronger base than F-

KOCl will hydrolysise strnoger

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