Experiment 1-Rates of Reaction

Experiment 1: Investigating the effect of temperature on reaction rate:

Aim:I want to investigate how temperature affects the reaction rate.

Equipment

• Conical flask
• Beaker
• Measuring cylinder
• Stopwatch
• Waterbath
• Black cross on paper “X”
• Thermometer
• 0.1mol/L Sodium Thiosulfate
• 2.0mol/L Hydrochloric acid

Method
Put the “X” paper on the bench mat, and put the conical mask on top of the paper.
Measure 50mL tolL of Sodium Thiosulfate solution and put it in the beaker.
Record the temperature of Sodium Thiosulfate.
Measure 50mL of HCL and pour this into the conical flask
Pour the sodium Thiosulfate into the conical flask, start the stopwatch and swirl the flask. Time how long it takes for the cross to disappear when viewed from above (I.e. look down the mouth of the conical flask).
Wash out the flask
Repeat the experiment, using a water bath to heat the sodium Thiosulfate To 30°C, then 40°C and finally 50°C. Keep the volume of acid the same each time.

Results:
The temperature of the Sodium Thiosulfate was 19°C.
It took 21 seconds for the "X" to disappear once we added the hydrochloric acid to the sodium Thiosulfate.

When we heated the sodium Thiosulfate to 30°C and added the hydrochloric acid, it took 11.24 seconds for the black "X" to disappear.

When we heated the sodium Thiosulfate to 40°C and added the hydrochloric acid it took 5.30 seconds for the black "X" to disappear.

When we heated the sodium Thiosulfate to 50°C and added the hydrochloric acid it took 3.90 seconds for the black "X" to disappear.