Mathematics
rossanafonseca
24

Show an equation and a solution for the problem. Arnold needs a 25% solution of nitric acid. He has 20 milliliters (ml) of a 30% solution. How many ml of a 15% solution should he add to obtain the required 25% solution?

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(1) Answers
emilysimp0112

Equation: acid + acid = acid 0.30*20 + 0.15x = 0.25*(20+x) Multiply thru by 100 to get: 30*20 + 15x = 25*20 + 25x 10x = 5*20 x = 10 ml (amt. of 15% solution needed)

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