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Sch 103: General And Physical Chemistry Question Paper

Sch 103: General And Physical Chemistry

Course:General And Physical Chemistry

Institution: University Of Nairobi question papers

Exam Year:2013

UNIVERSITY OF NAIROBI
SCH 103: GENERAL AND PHYSICAL CHEMISTRY CAT 2
FIRST YEAR EXAMINATIONS FOR THE DEGREE OF BACHELOR OF SCIENCE
14TH AUGUST, 2013
Instructions: answer all the questions
Time: 8:00- 9:00 AM
1. For the reaction at equilibrium:
C (g) + D (g) = 2E (g)…… +4000kj
a) Write the equilibrium constant expression in terms of:
i) Partial pressures and
ii) Concentration of the reactants and products. (2 marks)
b) Predict the direction of the reaction if the following is done to the mixture:
i) Pressure is increased
ii) Temperature is decreased
iii) Adding an inert gas
iv) A catalyst is added
Give a reason to support your answer (4 marks)
2. a) The pH of a pineapple juice sold at a supermarket in Nairobi was 4.82. calculate the H+ ion concentration of the pineapple juice. (3 marks)
c) consider the ionization of a weak acid, HA: HA (aq)= H+ (aq) + A- (aq)
i) derive the relation; pH= pKa + log [A-]/[HA] 4marks
ii) the pH a 0.10M solution of HA was found to be 2.8. calculate:
• the Ka of HA 3 marks
• the ionization of HA 2 marks
d) write shorts on the following:
i) industrial fractional distillation column 3 marks
ii) choosing optimal conditions for the synthesis of ammonia 3 marks
iii) dependence of % ionization on initial concentration of a weak acid and a strong acid 3 marks
iv) preparation of an acetate buffer solution whose pH is 4.92; pKa for acetic acid is 4.74. 3 marks

Sch 103: General And Physical Chemistry Question Paper

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