Equal amount of sodium thiosulphate solution are taken in two test tubes and one of them is heated. Then equal amount of dilute hcl are added in both test tubes.
Which is the substance precipitated here
Answers
Answer: The speed of chemical reactions increases considerably on increasing the temperature.
Explanation:
Materials: Sodium thiosulphate, water, dilute HCl boiling tubes, beaker, spirit lamp
Aim: To illustrate the change in speed of chemical reaction with temperature.
Materials: Sodium thiosulphate, water, dilute HCl, boiling tubes, beaker, spirit lamp.
Procedure:
1. Take powdered sodium thiosulphate crystals in a beaker, dissolve them in water and prepare a dilute solution.
2. Take equal quantities of this solution in two boiling tubes. Heat the solution in one boiling tube using a spirit lamp.
3. Now, add equal quantites of dilute hydrochloric acid into the two boiling tubes and observe. Note down the observation in your science diary.
Observation: The colour change is due to the precipitation of sulphur as a result of the reaction. When heated, the kinetic energy of the molecules increases resulting in an increase in the number of effective collisions. Thus, the speed of the reaction increases. In general, the speed of chemical reactions increases considerably on increasing the temperature.