The experiment involves observing the disappearance of letter X when a mixture of solutions A1 and A2 is heated at different temperatures. The procedure is as follows: Measure specific volumes of A1 and A2, mix them in a flask, add a solution N, swirl the mixture, observe from above, and record the time taken for letter X to disappear completely. Repeat the procedure by varying the temperature as shown in the table.

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Study the reaction between sodium thiosulphate and hydrochloric acid at different temperatures. The chemicals provided are labelled as A$_1$ for 0.05 M sodium thiosulphate and A$_2$ for 1.0 M hydrochloric. Also, you are provided with a piece of white paper marked X on which a 100 cm$^3$ beaker containing the reaction mixture to be placed during the experiment. Measure 30cm$^3$ of A$_2$ and put it into the 100 cm$^3$ beaker place on top of the X marked on the piece of paper. Then, measure 30 cm$^3$ of A$_1$, put it into boiling tube, insert a thermometer into it and heat on water bath until it reaches a temperature of 40$^\circ$C. The next step, transfer the heated solution A$_1$ into the beaker containing solution A$_2$ and immediately starting the stop watch.

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