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Sagot :
Answer:
80% of HCl used is 0.75 of a liter
40% or HCl used is 0.25 of a liter.
Step-by-step explanation:
Comment
You need a total of 1 liter which has a concentration of 70%.
Let x be the concentration of the 80% HCl
Let 1-x be the concentration of the 40% HCl
Solution
(1 - x)*40/100 + x*80/100 = 70/100 * 1 Multiply by 100
40*(1-x) + 80x = 70 Remove the brackets (left)
40 - 40x + 80x = 70 Combine
40 + 40x = 70 Subtract 40 from both sides
40-40 + 40x = 70 - 40 Combine
40x = 30 Divide by 30
x = 30/40
Answer
x = 0.75 of a liter
1-x = 0.25 of a liter.
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