A stock solution of 70% v/v ethanol was diluted with distilled water to prepare 1L of 21% v/v ethanol. (Density of ethanol = 0.789 g/mL; MW of ethanol = 46 g/mol) Determine the initial volume of 70% v/v ethanol used in the preparation.

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 A stock solution of 70% v/v ethanol was diluted with distilled water to prepare 1L of 21% v/v ethanol. (Density of ethanol = 0.789 g/mL; MW of ethanol = 46 g/mol)

Determine the initial volume of 70% v/v ethanol used in the preparation.

How much water was added to the stock solution to make 1L of the final concentration?

The molarity of 5.0 mL of 70% v/v ethanol was found to be __________.

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