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______ is used for washing the soil portion passing through 4.75 mm sieve.

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______ is used for washing the soil portion passing through 4.75 mm sieve.

(a) distilled water

(b) 2g of sodium hexametaphosphate per litre of water

(c) 10% of brine solution

(d) kerosene

I have been asked this question in quiz.

My question is from Sieve Analysis topic in portion Index Properties Determination of Geotechnical Engineering I

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The correct choice is (b) 2g of sodium hexametaphosphate per litre of water

To explain I would say: Sodium hexametaphosphate acts as a dispersing agent that prevents flocculation or the combining of suspended matter into aggregates that settle due to gravity.

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