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C2 IAA ­ Rates of Reaction
C2.8 4a



Effect of temperature on the disappearing cross


In this experiment you are going to investigate how temperature affects the rate of reaction between
sodium thiosulphate solution and dilute hydrochloric acid (the disappearing cross reaction).

Method
Apparatus
Sodium thiosulphate solution stop clock
Dilute…

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C2 IAA ­ Rates of Reaction














HEAT






SODIUM THIOSULPHATE SOLUTION

STOP CLOCK



DILUT
E
HYDROCHL
ORI
C
ACI
D

E Time how long it takes for the cross to `disappear'. Pour the solution away as quickly as
possible.


F Repeat the experiment at 5 °C, 15 °C, 35 °C and…

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C2 IAA ­ Rates of Reaction
C2.8 4a
Investigating concentration and reaction rate F H


In this experiment you are going to investigate the effect of concentration on the rate of this
reaction:


magnesium + hydrochloric acid magnesium chloride + hydrogen


You are going to change the concentration of hydrochloric…

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C2 IAA ­ Rates of Reaction

RUBBER TUBING


STOP CLOCK


DILUTE HYDROCHLORIC
ACID


D Twist the bung to let the magnesium strip fall into the acid. Start the stop clock. Time how long
it takes to produce 20 cm3 of hydrogen gas.


E Write your results in your results table.…

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