SOLUTION: You need a 55% alcohol solution. On hand, you have a 770 mL of a 95% alcohol mixture. How much pure water will you need to add to obtain the desired solution? A) Write an equati

SOLUTION: You need a 55% alcohol solution. On hand, you have a 770 mL of a 95% alcohol mixture. How much pure water will you need to add to obtain the desired solution? A) Write an equati

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Question 766283: You need a 55% alcohol solution. On hand, you have a 770 mL of a 95% alcohol mixture. How much pure water will you need to add to obtain the desired solution?
A) Write an equation using the information as it is given above that can be used to solve this problem. Use x as your variable to represent the amount of pure water you need to use.

B) You will need HOW MANY mL of pure water to obtain HOW MANY mL of the desired 55% solution??
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

The number of mL of pure alcohol you have in 770 mL of a 95% solution is

. If you add

mL of pure water, you have

mL of solution of which

is pure alcohol. Since you added pure water, the amount of pure alcohol is the same, so:

Solve for

to get the amount of water to add, and then calculate

to find the total amount of solution.

John

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My calculator said it, I believe it, that settles it

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