(i) Put 25 mL 0.2 M copper sulphate solution in a 100 mL polythene fitted with a 1-hole
stopper and thermometer. Replace the stopper, invert the bottle and shake it gently.
Record the temperature of this solution. Turn the bottle the right way up, remove the
stopper and add 0.5 g of zinc dust. The quantity of zinc powder is in excess to ensure that
all the copper sulphate is used up in the reaction, so some zinc will remain when the reaction
stops. Replace the stopper, invert the bottle, and shake gently. Record the highest
temperature reached. Calculate the rise of temperature. This rise of temperature in not
affected by the volume of 0.2 M copper sulphate used for the experiment. For a 1 M
solution, multiply the rise in temperature by 5 (5 X 0.2M = 1.0 M). The reactants lost
energy to the solution. The temperature change is usually between 9oC and 10oC.
Zn(s) + Cu2+(aq) --> Zn2+(aq) + Cu(s).
(ii) Repeat the experiment with 0.5 g of iron powder or iron filings. This amount is again an
excess so that all the copper sulphate will be used up in the reaction. The temperature
change is usually between 6oC and 7oC.
sharon kalunda answered the question on April 12, 2019 at 09:04
- Describe an experiment that can be used to determine the heat of neutralization of a chemical reaction.(Solved)
Describe an experiment that can be used to determine the heat of neutralization of a chemical reaction.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment which shows that some chemical reactions take in heat from the surrounding.(Solved)
Describe an experiment which shows that some chemical reactions take in heat from the surrounding.
Date posted: April 12, 2019. Answers (1)
- Give an experimental procedure to show that some chemical reactions gives out heat.(Solved)
Give an experimental procedure to show that some chemical reactions gives out heat.
Date posted: April 12, 2019. Answers (1)
- Explain how soap is made from fats.(Solved)
Explain how soap is made from fats.
Date posted: April 12, 2019. Answers (1)
- Explain how titration of acids and bases is done in the laboratory.(Solved)
Explain how titration of acids and bases is done in the laboratory.
Date posted: April 12, 2019. Answers (1)
- Describe how magnesium metal reacts with carbon dioxide.(Solved)
Describe how magnesium metal reacts with carbon dioxide.
Date posted: April 12, 2019. Answers (1)
- Explain potassium permanganate is reduced by sulphur dioxide.(Solved)
Explain potassium permanganate is reduced by sulphur dioxide.
Date posted: April 12, 2019. Answers (1)
- How is sulphur dioxide prepared in the laboratory?(Solved)
How is sulphur dioxide prepared in the laboratory?
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show how hydrogen is displaced from acids by different metals.(Solved)
Describe an experiment to show how hydrogen is displaced from acids by different metals.
Date posted: April 12, 2019. Answers (1)
- Describe how sodium reacts with water.(Solved)
Describe how sodium reacts with water.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show how copper is displaced from aqueous solution of copper ions.(Solved)
Describe an experiment to show how copper is displaced from aqueous solution of copper ions.
Date posted: April 12, 2019. Answers (1)
- Describe the electrolysis of water.(Solved)
Describe the electrolysis of water.
Date posted: April 12, 2019. Answers (1)
- Describe the electrolysis of solutions of ionic salts.(Solved)
Describe the electrolysis of solutions of ionic salts.
Date posted: April 12, 2019. Answers (1)
- Describe the electrolysis of lead bromide.(Solved)
Describe the electrolysis of lead bromide.
Date posted: April 12, 2019. Answers (1)
- Describe how electrolysis is used to determine the salts which conduct electricity in solution form.(Solved)
Describe how electrolysis is used to determine the salts which conduct electricity in solution form.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show that some liquids conducts electricity.(Solved)
Describe an experiment to show that some liquids conducts electricity.
Date posted: April 12, 2019. Answers (1)
- Explain how to identify Solids that conduct electricity in the laboratory.(Solved)
Explain how to identify Solids that conduct electricity in the laboratory.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to estimate the size of an oil molecule.(Solved)
Describe an experiment to estimate the size of an oil molecule.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show how diffusion in liquids occurs.(Solved)
Describe an experiment to show how diffusion in liquids occurs.
Date posted: April 12, 2019. Answers (1)
- Explain how the diffusion rates of ammonia and hydrogen chloride gases can be compared.(Solved)
Explain how the diffusion rates of ammonia and hydrogen chloride gases can be compared.
Date posted: April 12, 2019. Answers (1)