Aim: to measure the chlorides in soil. Materials: Soil samples White porcelain crucible/dish Burette Dropper Beakers Glass Rod 50 ml volumetric pipette 1 ml graduated pipette
Reagents: Standard silver nitrate Potassium chromate indicator Procedure: 1. Prepare soil solution by taking 10 gm of soil into a measuring cylinder and making the volume to 100 ml by adding distilled water. 2. Add 50 ml of soil solution in a porcelain dish. 3. To this now add 1 ml of potassium chromate indicator. 4. The indicator gives a yellow colour to the sample. 5. This is titrated against silver nitrate until brick red colour develops. 6. Note the amount of silver nitrate consumed.
Results: Calculation: Amount of chloride in soil mg Interferce: Conclusion: SamplesourceBurette readingAmount of AgNO 3 consumed initialfinal
Aim: to determine the nitrate content of the given soil sample. Materials: Soil samples Distilled water White spot plate Diphenylamine Concentrated sulphuric acid
Procedure: Prepare a clear solution of each type of soil in distilled water (soil 1 part : water 5 parts). Take a small amount of each solution on white spot plate. Add to each sample,on white spot plate, 2-3 drops of diphenylamine an 2 drops of conc. Sulphuric acid. Blue colour will develops Note the degree of colour or depth (intensity). Arrange according to the degree of depth of colour. The darker the colour the more amount of nitrate present.
Results: Record the depth of colour using +, ++,+++,++++. Interference: Conclusion: