A photographer is mixing 2 liters of a 10% acetic acid solution with a 5% solution to get a 7% solution. How many liters of the 5% solution should he add?

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Answer 1 · 2018-05-29T17:47:06

The volume of #5%# acetic acid is #=3L#

Perform a material balance with respect to acetic acid.

Let the volume of #5%# acetic acid be #=vL#

Then the total volume is #=(2+v)L#

The material balance is

#2xx10/100+v*5/100=(2+v)*7/100#

#20+5v=14+7v#

#2v=20-14=6#

#v=3L#

The volume of #5%# acetic acid is #=3L#