KCSE Secondary Level Chemistry Practical  Question Paper

Exam Name: Chemistry Practical 

Course: Secondary Level

Institution/Board: KCSE

Exam Year:2011

NAME…………………………………………………………..ADM NO…………..CLASS…………….
TAKABA BOYS’ SECONDARY SCHOOL
FORM IV ENTRANCE EXAMINATIONS NOVEMBER 2010
KENYA CERTIFICATE OF SECONDARY EDUCATION

CHEMISTRY PRACTICAL
Time: 1 hr
You are provided with:
• Solution A, dilute hydrochloric acid .
• Solution B 0.25M sodium hydroxide solution.
Procedure
(i) Pipette 25.0cm3 of solution B into a conical flask.
Add 3 drops of phenolphthalein indicator. Titrate with dilute hydrochloric acid, solution A from the burette. Repeat until you obtain three concurrent readings. Record your results in the table below.

Table Burette readings
1st 2nd 3rd
Final Burette reading
Initial burette reading
Volume of solution A, used (cm3)
(3mks)
ii) Calculate the:
I average volume of solution A used. (1mk)



II Number of moles of sodium hydroxide, solution B contained in 25.0cm3 of 0.25M NaOH. (1mk)




III Write the equation of reaction between sodium hydroxide and the hydrochloric acid. (1mk)



IV The moles of the hydrochloric acid (solution A) reacting hence its molarity (2mks)



2. a) You are provided with solid Q. Carry out the tests below and write your observations and inferences in the spaces provided.





(i) Heat half of solid Q in a clean dry test tube, test the gases produced with both blue and red litmus paper.

Observation Inferences





2mks




1mk
(ii) Using a boiling tube, dissolve the rest of solid Q in about 10cm3 of water

Observation Inferences






1 mk





1 mk

I. To about 2cm3 of the solution in (ii) above, add aqueous ammonia solution drop wise until in excess
Observation Inferences





2mks




1mk

II . To about 2cm3 of the solution, add 3 drops of sodium chloride solution.
Observation Inferences





1mk




1mk





III. Warm the mixture in II above.
Observation Inferences





1mk




1mk



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