Page 169 - Chemistry

3
Volume of G added (cm ) 0 5 10 15 20 25 30
3
Volume of F (cm ) 25 25 25 25 25 25 25
o
Temperature ( C)

(b) On the grid provided, plot a graph of temperature (vertical axis) versus volume
of solution G added
(c) From the graph, determine:
3
(i) The volume of solution G required to react with the 25cm of sodium hydroxide
solution F
(ii) The highest temperature change
(d) Calculate the heat change for the reaction
-1o
(Heat change = Mass x temperature change x 4.2jg C. Assume density of each
-3
solution to be 1gcm )
(e) Calculate the volume of sodium hydroxide solution F, used
(f) Calculate the molar heat of neutralization of sodium hydroxide solution F

3 You are provided with substance D, which contains two cations and one anion.
Carry out the test below on the substance. Enter your observations in the table below.
Write your observations and inferences in the spaces Provided
3
(a) Place a spatula end full of D in a boiling tube. Add about 5cm of distilled water and shake.
Divide the resultant mixture into 4 portions
i) To the first portion, add Nitric acid followed by Barium nitrate solution.
ii) To the second portion, add Nitric acid, followed by lead (II) Nitrate solution
iii) To the third portion, add a few drops of sodium Hydroxide solution until in excess
iv) To the fourth portion, add aqueous ammonia drop wise till in excess solution

TRANS MARA DISTRICT
CONFIDENTIAL
INSTRUCTIONS
Each candidate should have :

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 80 cm of solution T
3
 100 cm of solution S
 Exactly 1.5g of solid V
3
 250cm beaker (glass)
 1 label
 1 pipette
 1 burette
3
 100cm measuring cylinder
 1.2g
3
 120cm plastic beaker
 A stop clock /watch
 About 1.0g of solid J
 1 boiling tube
 1 metallic spatula
 1 glass rod
 5 test tubes
 1 filter paper

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