Diluting solution question

by Stan

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)

Click here to post comments.

Join in and write your own page! It's easy to do. How?
Simply click here to return to Pharmacy math questions