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yeah,sure.its so simple to find out the active clay in green sand.Active clay means ,the total active amount of clay(bentonite) present in a sample of green sand.

Test Procedure:-

Take some sample of green sand and keep it in a oven for 1hr at a temp of 100 deg celsious.This procedure is to make the sand free from moisture.Measure 5gms of this sand after taken from oven and put it in a conical flask with a 50ml of distilled water.Then again keep this in the oven for 10-15 min to boil the solution.Take this from the oven and keep it for a few mins to get cool.Then pour 2ml of diluted h2so4(sulphuric acid) in to the same mixture and place the flask under a burette filled with methylene blue.Then start the titration by leaving methylene blue to the flask containing the above said solution of sand.Shake the flask continously to allow the methylene blue to equally mix with the sand.Stop the titration alternately and place a single drop of solution from the flask in to a filter paper.If you find a light blue ring colour around the dark blue colour(colour of methylene blue) , its the end of itration and read the burette reading.Other wise you can continue titration until you get as above said.

calculation:-

for example , suppose burette reading is 74

there fore active clay = 74/5 =14.8% (for 5gm sample of sand)

Hope you understood the procedure

Thank you.

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Q: What is the Procedures for testing Active clay in Green Sand?
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