SOLUTION: A chemist has 400 milliliters of a solution that is half acid. She needs a solution that is 60% acid. How many millilters of acid should she add?

Question 619276: A chemist has 400 milliliters of a solution that is half acid. She needs a solution that is 60% acid. How many millilters of acid should she add?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A chemist has 400 milliliters of a solution that is half acid. She needs a solution that is 60% acid. How many millilters of acid should she add?
------
Equation:
acid + acid = acid
0.50*400 + x = 0.60(400+x)
-------------------------------------
Multiply thru by 100 to get:
50*400 + 100x = 60*400 + 60x
40x = 10*400
x = 100 mL (amt. of acid to be added)
======================================
Cheers,
Stan H.
==============
RELATED QUESTIONS
A chemist has 600 milliliters of a solution that is half acid. She needs a solution that... (answered by nerdybill)

A chemist has 200 milliliters of a solution that is 20% acid. She needs a solution that... (answered by robertb)

A chemist has 300 mL of a solution that is half acid. She needs a solution that is 90%... (answered by josgarithmetic)

A chemist has 400 milliliters of solution that is 21% acid. How mauny milliliters of acid (answered by Nate)

33. A chemist has two acid solutions. Solution X contains 14% acid and the other solution (answered by Alan3354)

a chemist has 600 ml of a solution that is half acid. she needs 70% oof acid. how much... (answered by josmiceli)

Achemist has 600ml of a solution that is half acid. She needs a solution that is 70%... (answered by ankor@dixie-net.com)

A chemist has one solution that is 80% acid and a second solution that is 44% acid. She... (answered by Fombitz)

A chemist has 300 milliliters (mL) of solution that is 18% acid. How many milliliters of... (answered by pwac)