Diluting solution question

by Stan
(Ok)

How much 95% ethyl alcohol is needed to make 5ml of 50% alcohol solution? How much water is needed?

Reply: (Keith)


Stan, you could solve this either using an Alligation Tic-tac-toe grid, or using Algebra.


Here's the Algebra Set-up

(.95)(X) = (.50)(5mL)



(solve for X, that will be how many mL of the 95% to use.
Then the difference to 5mL will be the water)