SOLUTION: a chemist needs a solution that is 75% acid but only has solutions that are 35% and 85% acid. If The chemist measures 120ml of the 85% solution, how many milliliters of the 35% so

Question 367508: a chemist needs a solution that is 75% acid but only has solutions that are 35% and 85% acid. If The chemist measures 120ml of the 85% solution, how many milliliters of the 35% solution should she add to make a 75% solution?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a chemist needs a solution that is 75% acid but only has solutions that are 35% and 85% acid. If The chemist measures 120ml of the 85% solution, how many milliliters of the 35% solution should she add to make a 75% solution?
--------------------
Equation:
acid + acid = acid
0.35x + 0.85*120 = 0.75(x+120)
-----
Multiply thru by 100 to get:
35x + 85*120 = 75x + 75*120
40x = 10*120
x = 30ml (amt. of 35% solution needed for the mix)
==================
Cheers,
Stan H.
==================
RELATED QUESTIONS
a chemist needed a 75% acid solution but only has 35% acid and 85% acid solutions. if he... (answered by stanbon)

A chemist has one solution of acid and water that is 75% acid and another solution that... (answered by Alan3354)

A chemist needs 200 milimeters of a 49% acid solution but only has 37% and 57% acid... (answered by checkley77)

A chemist has three different acid solutions. The first acid solution contains 25 %... (answered by ikleyn)

For an experiment, a chemist needs 12 liters of a solution that is 30% hydrochloric acid. (answered by mananth)

A chemist needs a 26% acid mixture, but his lab only has 20% and 35% solutions. If he... (answered by Alan3354,stanbon)

A chemist wishes to make a 14% acid solution. She has an 8% acid solution and a solution... (answered by josgarithmetic)

A chemist needs a saline solution that is 20% sodium chloride but only has solutions that (answered by checkley77)