A nurse is combining one solution with an 8% concentration of acid in water with another solution that has 15% concentration of acid in water.if the nurse use 120ml of 8% solution, what volume of 15% solution should be used to obtain a mixture with 12% concentration?
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Answer:
160ml(important)
step by step explanation:
the ratio in which solution with 8% concentration and 15% concentration should be mixed to get a mixture with 12% concentration
= (15-12)% : (12-8)%
= 3:4
3x = 120 => x = 40
therefore, solution with 15% concentration to be used
= 4x = 4(40) = 160 ml
2nd method :
let sol. with 15% conc. be x and mixture with 12% conc. be y
x + 120 = y --(1)
8% of 120 + 15% of x = 12% of y
1/100(960 + 15x) = 12/100( x + 120)
960+ 15x = 12x + 1440
3x = 480 => x = 160 ml Answer
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