Saturday, 16 April 2016

Rate of reaction, concentration & temperature

Equipment

2cm strips of Mg ribbon
Different concentrations of Hydrochloric acid (0.1, 0.5, 1 and 2 molar)
Test tubes
Test tube rack
Measuring cylinder
Thermometer
Stopclock
Goggles

Method

Place 10ml of the first concentration of acid to be used into a test tube. Place in the thermometer and record the temperature of the acid.
Drop in one of the Mg ribbon strips and start the stopclock.
Observe the reaction, looking for gas being produced. When the reaction stops stop the stopclock. If there is any of the Mg ribbon left this should be noted in an observations column. Note the end temperature.
Repeat this twice more using the same concentration of acid. Repeat the whole process of three tests with each different concentration of acid.

Safety

Goggles should be worn throughout the experiment. Spills should be mopped up straight away. Extra care should be taken when handling the most concentrated acid.

Analysis

The rate of reaction is affected by both concentration and temperature. Does the heating effect of the reaction affect it's rate? How could the above exepriment be adapted to eliminate the heating effect of the reaction and that there may not be enough reactants to complete the reaction?