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Essay Details:
Essay text:
The same person must do the timing and watch the cross through the top of the flask, because different people have different reaction times. The concentration of acid used will be: 1.0M, 0,8M, 0.6M, 0.4M and 0.2M.
Apparatus
The apparatus for the test is:
? A 100ml conical flask
? A piece of paper with a black cross drawn on it
? Sodium thiosulphate
? Hydrochloric acid
? 2 measuring cylinders ? one 10ml and one 25ml
? Stopwatch
Prediction
Using the particle collision theory, I predict that the less concentrated the acid the slower the cross will disappear. This is because in a more concentrated solution there will be more hydrochloric acid molecules, which means that there will be more collisions between the hydrochloric acid molecules and the sodium thiosulphate molecules...
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