C2 IAA experiment

This is just the experiment that is used in the IAA 

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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 hydrochloric acid
Bunsen burner
Large measuring cylinder tripod
Small measuring cylinder heatproof mat
Conical flask gauze
Scrap piece of paper (to draw a cross on)
Thermometer
eye protection
(A fridge or icecold water may be needed)
Do not breathe in any
gas given off, as it is toxic. Asthmatics should take particular care. Be careful
with hot apparatus. Wash out the conical flask immediately after each experiment. Wear eye protection.
A Draw a table like the one on sheet 2 to
record your results in. You will need to leave five rows for your answers.
B Carefully measure out 5 cm3 of hydrochloric acid and leave it in the measuring cylinder on one
side. You will need it later.
C Measure out 50 cm3 of sodium thiosulphate solution. Pour it into a conical flask and warm it
to 25 °C. If
you have access to a water bath, use it instead of heating the solution with a Bunsen burner.
D When the temperature has reached
25 °C, take the flask off the heat. Put
the flask on a cross drawn on a piece of paper. Pour the acid into the flask and start the stop
clock straight away.
THERMOMETER
SODIUM THIOSULPHATE SOLUTION

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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 45 °C. Be careful not to heat beyond 45 °C.…read more

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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 acid and time how long it takes to collect
20 cm3 of hydrogen. You can change the concentration of acid by diluting it with water.…read more

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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.
F Repeat the experiment with the other concentrations of acid.…read more

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