Kinetics Study on the Reaction between Sodium Thiosulphate and Hydrochloric Acid - MeitY OLabs

The experiment requires 0.1 M sodium thiosulfate solution, 1 M hydrochloric acid, five 250 ml conical flasks (labeled A-E), measuring jars, a white tile with a cross mark, and a stopwatch.

Different volumes of 0.1 M sodium thiosulfate solution (10, 20, 30, 40, 50 mL) are added to flasks A through E, respectively. Distilled water is then added to each flask to bring the total volume to 50 mL, creating solutions with concentrations ranging from 0.02 M to 0.1 M.

10 mL of 1 M hydrochloric acid is added to each flask containing the sodium thiosulfate solution. A stopwatch is started immediately as the acid is added. The solution is observed until the insoluble sulfur formed makes the cross mark on the white tile invisible, and the time taken is recorded.

A graph is plotted with 1/T (inverse of time, representing reaction rate) on the y-axis and the concentration of sodium thiosulfate on the x-axis. The resulting straight sloping line demonstrates that 1/T is directly proportional to the concentration of sodium thiosulfate, indicating that the reaction rate is directly proportional to the sodium thiosulfate concentration.