has a pH of 7.0 Q9 (MC) A 0.1 M solution of A) NaHS B) NaF C) KNO3 D) NH4CI E) C
ID: 561057 • Letter: H
Question
has a pH of 7.0 Q9 (MC) A 0.1 M solution of A) NaHS B) NaF C) KNO3 D) NH4CI E) CsF Ql0 (MC) The Ka of an unknown acid HA is 1.8 x 10%. What is the pH at 25.0°C of an aqueous solution that is 0.100 M in HA? A) +2.87 B) -2.87 C)1.13 D) +11.13 E) +6.61 Q11 (MC) Consider the following reaction at equilibrium: C (s) + H2O (g) CO(g) + H2(g) Which of the following conditions will decrease the partial pressure of CO? A) decreasing the volume of the reaction vessel B) increasing the volume of the reaction vessel C) decreasing the amount of carbon in the system D) decreasing the pressure of the reaction vessel E) adding a catalyst to the reaction systemExplanation / Answer
9)
option C is the answer.
because KNO3 is the salt of strong acid(HNO3) and strong base (KOH).
so PH = 7.0
10)
PKa = - log Ka = - log (1.8*10^-5) = 4.75
PH = 0.5 * PKa - 0.5 * log C
PH = 0.5 * 4.75 - 0.5 log (0.10)
PH = 2.375 + 0.5
PH = 2.87
option A is the answer.
11)
in this reaction, forward reaction leads to the increase in pressure and volume.
so option A, C and D are the answers.
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