The experiments conducted by two students are given below:
Experiment 1
2 mL of sodium thiosulphate solution is taken in a test tube, heated and to it 2mL of HCl solution is added.
Experiment 2
2mL of sodium thiosuphate solution is taken in a test tube and to it 2mL of HCl solution is added.
a) In which experiment is the precipitate formed quickly? Justify your answer.
b) Write the balanced equation for the reaction.

Explanation

a) In the first experiment , when temperature increases the number of molecules with threshold energy increases. As a result number of effective collisions increases and this increases the rate of the reaction.
b) .Na_2S_2O_3 + 2HCl rarr 2NaCl + 2H_2O +SO_2 +S..