The pH of an aqueous 0.00796 M solution of HIO_3 is 2.12. What is the K_a of HIO

Question

The pH of an aqueous 0.00796 M solution of HIO_3 is 2.12. What is the K_a of HIO_3? Do not assume that ionization is negligible with respect to the initial concentration. (A) 0.16 (B) 0.076 (C) 0.00037 (D) 0.21 Which conjugate acid/base pair is not correctly paired? (A) H_2SO_4 & SO_4^2- (B) H_2O & OH^- (C) HBr & Br^- (D) NHO_3 & NO_3^- What is the value of the rate constant for a first-order reaction for which the half-life is 26.7 min? (A) 18.5 min^-1 (B) 38.5 min^-1 (C) 9.25 min^-1 (D) 0.0260 min^-1 In order to obtain the activation energy of a reaction using a graphical method, _____ is plotted against ___, giving a straight line whose slope is equal to ____. (A) k; 1/T; -E_a (B) Ink; 1/T; -E_a/R (C) Ink; T; -E_a/R (D) k; 1/T; -E_a/R Which of the following is not a characteristic property of bases? (A) turn litmus from pink to blue (B) neutralize acids (C) react with carbonates to produce carbon dioxide gas (D) feel slippery What is the hydronium ion concentration in a solution with a of 2.80? 6.3 times 10^2 mol/L

Explanation / Answer

Q14

HIO3 <--> H+ IO3-

pH = 2.12

[H+] = 10^-pH = 10^-2.12 = 0.007585 M

note that, due to stoichiometry, [H+] = [IO3-] = 0.007585

[HIO3] = 0.00796-0.007585 = 0.000375 M

the Ka value:

Ka = [H+][IO3-]/[HIO3]

Ka = (0.007585*0.007585)/(0.000375)

Ka = 0.153419 = 0.16 is the nearest value

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