how would you prepare 250ml of 70 percentage (v/v) of ethanol
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70 % = (volume of rubbing alcohol / total volume of solution) x 100 x 100 %
So
Volume of rubbing alcohol = volume of solution x (70/100) = 250 x (70/100)
Volume of rubbing alcohol = 175 ml
You would add enough water to 175 mL of rubbing alcohol to make a total of 250 mL of solution.
i hope it will help you
regards
So
Volume of rubbing alcohol = volume of solution x (70/100) = 250 x (70/100)
Volume of rubbing alcohol = 175 ml
You would add enough water to 175 mL of rubbing alcohol to make a total of 250 mL of solution.
i hope it will help you
regards
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