Temperature has an effect on the rate at which a reaction occurs. This page outlines an investigation to research this effect.
- 100cm3 beaker
- Test tube
- Sodium thiosulphate solution
- Hydrochloric acid
- Water bath
- Pen and paper
As you will be using an acid, you should make sure you are wearing eye protection and a lab coat at all times.
Once you have completed each test, you can safely pour the resulting mixture down the sink, as the reaction will neutralise the acid and alkali you will be using, making them safe to pour away. However, you must not pour any of the reactants down the sink before they have been used, as they will still be strongly acidic or alkaline.
- Using a measuring cylinder, measure out 20cm3 of sodium thiosulphate solution into a beaker.
- Using a pipette, measure 5cm3 of hydrochloric acid into a test tube.
- Heat the beaker of sodium thiosulphate solution up to a 30 degrees Celsius using the water bath.
- Once the beaker reaches the specified temperature, place the beaker on top of a piece of paper with a cross drawn on it.
- Add the hydrochloric acid to the beaker, and start a timer.
- Once the cross is no longer visible, stop the timer, and record your result.
- Repeat the investigation for different temperatures. You should repeat the investigation a minimum of 3 times, but 7 times if possible.