Calculate the pOH of a solution that contains 3.9 times 10^-4 m H_3 O degree at

Question

Calculate the pOH of a solution that contains 3.9 times 10^-4 m H_3 O degree at 25 degree C 3.31 0.59 4.59 9.14 10.59 Determine the K_a of a 0.294 M acid solution that has a pH of 2.80. 1.2 times 10^-5 4.9 times 10^-7 8.5 times 10^-6 5.4 times 10^-3 27 Determine the pH of a 0.188 M NH_3 solution at 25 degree C. The K_b of NH_3 is 176 times 10^-5. 11.260 2.740 8.520 5.480 12.656 Which one of the following will form an acidic solution in water? NaF KNO_3 NH_4Cl None of the above solutions will be acidic. Identify the strongest add. HClO_4 HClO_3 HClO HClO_2 Give the characteristics of a strong acid. Has a weaker bond to hydrogen? Ionizes completely in aqueous solutions. Has a polar bond. All of the above.

Explanation / Answer

15)

H3O+ ion cocn = 3.9x10-4

pH = -log(H3O+) = -log (3.9x10-4)

= 4.59

Correct option is (c)

(16)

HA <---------->H+ + A-

initial conc. 0.294             0        0

change       -x                 +x       +x

at equ.      0.294           +x      +x

       ka=x^2/0.294

Here, x=[H+]=10^-2.80=1.58*10^-3

ka=(1.58*10^-3)^2/0.294

ka=8.49*10^-6 M

Pls post other questions separately. only one should be answered according to chegg guidelines

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