QUESTION 20 What is n for the following equation in relating K c to K p ? N 2 O
ID: 994280 • Letter: Q
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