The pH of 0.18 M aqueous sodium hypochlorite is 10.38. What is the value of K_a

Question

The pH of 0.18 M aqueous sodium hypochlorite is 10.38. What is the value of K_a for HCIO? 3.2 Times 10^-7 3.1 Times 10^-8 5.8 Times 10^-8 4.2 Times 10^-11 2.4 Times 0^-4 The pH of 0.10 M (CH_3)_3NHCl(aq) is 5.40. What is the value of K_b for (CH_3)_3N? 4.0 Times 10^-12 6.3 Times 10^-5 4.0 Times 10^-6 6.3 Times 10^-4 1.6 Times 10^-10 At the stoichiometric point in the titration of 0.130 M HCOOH(aq) with 0.130 M KOH(aq), [HCO_2-] = 0.0650 M [HCO_2^-] = 0.130M the pH is less than 7. the pH is 7.0. [HCOOH] = 0.0650 M At the stoichiometric point in the titration of 0.260 M CH_3NH_2(aq) with 0.260 M HCl(aq), [CH_3NH_2] = 0.130 M. the pH is greater than 7. [CH-3NH_3^+] = 0.260 M the pH is 7.0. [CH_3NH_3^+] = 0.130 M What is the pH at the stoichiometric point for the titration of 0.100 M CH_3COOH(aq) with 0.100 M KOH(aq)? The value of K_a for acetic acid is 1.8 Times 10^-5. Can use approximation. 8.72 5.28 9.26 9.98 7.00

Explanation / Answer

11.

A- + H2O = HA + OH-

Kb =[OH-]HA]/[A-]

[OH-] = 10^-pOH = 10^-(14-10.38) = 0.000239

then

Kb = (0.000239)(0.000239)/(0.18-0.000239) = 3.1776*10^-7

Ka = Kw/Kb = (10^-14)/(3.1776*10^-7) = 3.14*10^-8

choose B

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