SOLUTION: In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of a 10% solution are needed? A. 4.5L B. 2.5

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 Question 22894: In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of a 10% solution are needed? A. 4.5L B. 2.5L C. 7.0L D. 3.5LAnswer by Paul(988)   (Show Source): You can put this solution on YOUR website!14x+6(7-x)=10(7) 14x+42-6x=70 8x=28 x=3.5 Hence, 3.5L of 10% solution is needed.