How to make H2SO4 in lab and safety measures to take

How to make H₂SO₄ in lab is a detailed post that provides information how to make Sulphuric acid in lab. Sulphuric acid is a strong acid with a pungent smell and the ability to dissolve many different materials. It is used in the manufacture of fertilizers and explosives. The following steps explains how to make Sulphuric acid in lab;

1. Take a beaker and dissolve 35 g of iron (III) sulphate in water.

This is done by adding the iron (III) sulphate in small portions to the water and then stirring it using a glass rod. It is important to make sure that the mixture is diluted. If it is not, the iron (III) sulphate will precipitate. The iron (III) sulphate will react with the water to form a precipitate of iron hydroxide. The iron hydroxide can be removed by filtering the mixture through a stainless-steel filter and washing it with distilled water.

2. To separate the predominating ions from the precipitate, dissolve 30 g of potassium nitrate in water.

Mix in a solution of calcium carbonate until dissolved and add a little bit of hydrochloric acid to make sure that it is no more basic than normal pure water. The hydrochloric acid will react with any remaining sulphuric acid to form pure chlorine gas and so you can use hydrogen chloride gas to stop this reaction by bubbling some into the mixture.

3. To the mixture of iron (III) ions add hydrochloric acid drop by drop whilst cooling the solution with ice.

The hydrogen chloride gas will react with any undissolved calcium carbonate to form calcium chloride and so it is important that there is no insoluble calcium present before adding the hydrochloric acid. The reaction is as follows:

FeSO₄ + 2HCl → FeCl₂ + H₂SO₄.

4. Keep adding the hydrochloric acid until a sample of the solution has a pH of 2 or less and then terminate the reaction by bubbling in nitrogen gas once more. Fill up to about 250 ml with water and evaporate to dryness.

5. The solution will be quite yellow because of the presence of both iron (III) ions and hydrochloric acid as well as the insoluble calcium chloride. Make sure that none of these materials are present in the finished product before starting your experiment. The product is called Crystal sulphuric acid or H₂SO₄.

6. The product of the above reaction can be dissolved in water to make a clear solution. The concentration of Iron (III) ions will be 0.7 mol/L (140 μg/ml) and that of hydrochloric acid will be 1.2 mol/L (275 μg/ml). This step explains how to make H₂SO₄ in lab.

Safety measures

1. Wear eye protection

The presence of iron in the mixture could affect eyesight if a concentrated solution is accidentally splashed into your eyes. The mixture is also acidic and could irritate skin.

2. Wear gloves.

The presence of iron in the mixture could affect the skin. The mixture is also acidic and could irritate the skin if a concentrated solution is accidentally splashed onto your hands. This makes a protective glove a good idea!

3. Invest in a safety waste disposal system.

Iron (III) ions are toxic so always take precautions when handling the product. Don't allow children to play with the solution, wash your hands after handling it, and be careful when disposing of it down the sink as it reacts with water to produce iron (III) sulphate which is highly acidic! You could also add some muriatic acid to the solution as this will convert any undissolved iron (III) ions into non-toxic iron(II) oxide. The solution will turn bright yellowish green in colour.

4. Solutions from general chemical labs are not suitable for food preparation.

The solution could react excessively with the skin and eyes, so always handle the product with care. Do not go near any flames when handling it and do not allow children to play with it. Use in a fume hood or wear gloves.

5. Keep an eye on reactions involving acids, bases and water that may occur due to potential reactions taking place in solution and add them cautiously, since these reactions can cause violent and explosive eruptions if they are left unattended.

In conclusion, how to make H₂SO₄ in lab? can be done by using iron (III) sulphate solution, iron (II) chloride solution, hydrochloric acid solution, and sodium hydroxide solution.