Problema Solution
A student needs 10% hydrochloric acid for a chemistry experiment. How much 5% acid should be mixed with 120 milliliters of 20% acid to get a 10% solution?
Answer provided by our tutors
let
x = ml of the 5% acid
y = 120 ml of 20% acid
0.05x + 0.20y = 0.10(x + y)
0.05x + 0.20*120 = 0.10(x + 120)
by solving we find
x = 240 ml
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240 ml of 5% acid should be used for the mix.