Rates of Reaction

Rates of Reaction

Experiment 1

Aim:

I want to investigate how temperature effects the rate of reaction

Equipment:

• Conical Flask
• Beaker
• Measuring Cylinder
• Stopwatch
• Black cross on paper
• Water Bath
• Thermometer
• 0.1 moL-1 Sodium Thiosulfate
• 1.0 moL-1 Hydrochloric Acid (HCl)

Method:

• Put the 'X' paper on the bench mat and out the conical flask on top of the paper.
• Measure 50 mL of sodium thiosulfate solution and put it into the beaker.
• Record the temperature of the sodium thiosulfate.
• Measure 5 mL of HCl and pour it into the conical flask.
• Pour the thiosulfate into the conical flask, start the stopwatch and swirl the flask. Time how long it takes for the cross to dissappear when viewed from above (i.e. look down the mouth of the concical flask.
• Wash out the flask thoroughly.
• Repeat the experiment, using a water bath to heat the sodium thiosulfate to 30 degrees then 40 degrees and finally 50 degrees. Keep the volume of acid the same each time.

Results:

Temperature (degrees celcius)	Time (seconds)
20	27
30	8
40	7
50	5

Conclusion:

In this investigation, I found that heat has an effect on the rate at which two reactants, react. By increasing the temperature of the reacting chemicals, it causes the particles to move faster, therefore forming a faster reaction speed.

Experiment 2

Aim:

I want to investigate how concentration has an effect on reaction time.

Equipment

• Conical Flask

• Beaker

• Measuring Cylinder

• Stopwatch

• Waterbath

• Paper with a black cross "X"

• Thermometer

• 0.1mol/L Sodium Thiosulfate

• 2.0mol/L Hydrochloric Acid

Method:

1.  Put the piece of paper with the 'X' on the bench.
2.  Measure 10mL of Sodium Thiosulfate and put it into the conical flask.
3.  Measure 40 mL of Water and put it into the conical flask. Swirl to mix.
4.  Measure 5mL of HCl.
5. Pour the HCl into the conical flask, start timer and swirl the flask.
6. Stop timing when you can no longer see the 'X' on the paper underneath the conical flask.
7. Wash out flask thoroughly.
8. Repeat experiment:

20mL of Sodium Thiosulfate and 30mL of Water

30mL of Sodium Thiosulfate and 20mL of Water

40mL of Sodium Thiosulfate and 10mL of Water

50mL of Sodium Thiosulfate and no Water

Results:

10mL Thiosulfate/40mL Water - 239 seconds for the