Bordeaux mixture

Bordeaux Mixture

Preparing 1% Bordeaux Mixture:

Dissolve 400 gms of Cu So4 - in 20 Litres of water in a container.

Dissolve 400 gms of Lime - in 20 Litres of water in another container.

Slowly pour Cu So4 solution into the lime solution. Stir well continuously.

(OR)

Dissolve 1 Kg of Cu So4 - in 50 Litres of water in a container.

Dissolve 1 Kg of Lime - in 50 Litres of water in another container.

Slowly pour Cu So4 solution into the lime solution. Stir well continuously.

(OR)

Dissolve 1 Kg of Cu So4 - in 5 Litres of water in a container.

Dissolve 1 Kg of Lime - in 5 Litres of water in another container.

Slowly pour Cu So4 solution into the lime solution. You will get a very thick paste like mixture that can be applied on cut wounds of trees using a brush. Add 90 litres of water to obtain 1% Bordeaux Mixture.

• CaCo3 – Calcium Carbonate, Ca O – Quick Lime, Slaked Lime – Ca (OH) 2

• The preparation vessel should be made of plastic or wood.

• Always pour Cu So4 solution into the lime solution and not vice versa.

• The resultant solution should be neither acidic nor alkaline. (Neutral)

• Litmus paper should show the value at 5.5 to 6.

• If the pH value is more than 8, then add Cu So4 solution and repeat the test.

• When a polished iron knife is dipped into the solution, copper should not be deposited on it. If so, then add Lime solution and repeat the test.