Question

how would you confirm that a colourless liquid given to you is pure water

Answer 1

take a litmus paper and put the litmus paper in the colourless liquid if litmus paper change it's colour in into Blue or red then it's not a pure water if it's not change it's colour then it's a pure water..

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Answer 2

Pure water is obtained by fractional distillation. It has only water molecules. By this we conclude purity of water.