QUESTION 20 What is n for the following equation in relating K c to K p ? N 2 O

Question

QUESTION 20

       What is n for the following equation in relating Kc to Kp?

         N2O4(g) 2NO2(g)

QUESTION 21

       What is the pH of pure water at 40.0°C if the Kw at this temperature is 2.92 × 10-14?

QUESTION 22

       Which of the following is NOT a conjugate acid-base pair?

       NH4+/NH3

       H/OH

       C2H3O2/HC2H3O2

       H2SO3/HSO3

       All of the above are conjugate acid-base pairs.

QUESTION 23

       Which of the following solutions would have the highest pH? Assume that they are all 0.10 M in acid at 25C. The acid is followed by its Ka value.

       HF, 3.5 × 10-4

       HClO2, 1.1 × 10-2

       HNO2, 4.6 × 10-4

       HCHO2, 1.8 × 10-4

       HCN, 4.9 × 10-10

Explanation / Answer

20.   N2O4(g) 2NO2(g)

Dn = 2-1 = 1

21. kw = 2.92*10^-14 = s^2

s = concentration of [H+] = 1.7*10^-7 M

pH = -log[H+] = -log(1.7*10^-7) = 6.77

22.

   NH4+/NH3

   C2H3O2/HC2H3O2

   H2SO3/HSO3

23. if pka increases , pH increases.so that

answer: HCN, 4.9 × 10-10

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