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A flask is used to mantain temperature of something inside it. It prevents the loss of heat through convection, conduction or radiation. It has a vaccum in between the refill â¦and the wall which stops convection and conduction. The walls are coloured white so that heat does not radiate.
The flask contains starch, protein, sodium chloride, and. sodium sulfate in an aqueous solution. A bag is prepared. containing this cocktail. The bag is then placed in a. beaker of distilled water for 60 minutes. At the end of 60. minutes the water of beaker is tested for the presence of.