Question

A pharmacist needs to strengthen a 15% alcohol solution to one of 32% alcohol. How much pure alcohol should be added to 800 ml of 15% solution ?? IT'S MY FINAL EXAM QUESTION .. PLEASE ANSWER ......

Answer 1

since Dec 10 2008. Let the required number of milliliters of pure alcohol be x ml. Given 15% of 400 ml shd be added with 100% pure alcohol. Hence 400(15%) + x(100%) = (400+x)(32%) Thus 100 ml of pure alcohol is required to make it 32%