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21 March, 13:41

A pharmacist has 80 milileters of a 25 percent saline solution. Which expression can be used to find the percentage of the concentration

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  1. 21 March, 14:08
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    Step-by-step explanation:

    Final concentration % = [grams of salt / mililiters of solution] * 100

    grams of salt = grams of salt from solution 1 + grams of salt from solution 2

    grams of salt from solution 1 = mililiters * %/100 = 80 mililiters * 0.25 g/mililiters = 20 g

    grams of salt from solution 2 = mililiters * %/100 = x*0.10 g/mililiters = 0.1x

    mililiters of final solution = mililiters from solution 1 + mililiters from solution 2

    mililiters of final solution = 80 mililiters + x mililiters

    => Final concentration, % = [0,10x + 20 g] / [x + 80 mililiters] * 100
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