Describe an experiment to show the effect of concentration on the rate of the reaction between potassium persuphate and potassium iodide.

Explanation

Equation
Procedure
Tabular column + graph
Conclusion
Detailed Answer:
`K_2S_2O_8 + 2KI to 2K_2SO_4 + I_2`
Procedure : Prepare the reaction mixture by mixing 25 ml each of `0.1 N K_2 S_2O_8 + 0.1 N KI` kept at `t_1""^@C` and start the stop clock. At regular intervals of time, a sample of the mixture (5 ml) is  pipetted into a conical flask containing ice cold water and little KI). It is then titrated against `0.1 Na_2 S_2O_3` using starch as indicator (added near the end point). End point is disappearance of blue colour. Volume of `Na_2 S_2O_3` consumed is recorded. Repeat the above procedure by keeping the reactants at `t_2""^@C`

Conclusion: The rate of chemical reaction increases with increase in temperature.