by Sandy

(Raleigh)

Example problem in the book:

Prepare 1/2 L solution of 70% alcohol from 50% alcohol and 95% alcohol

500ml x .7 = 350g

Here is the part I don't understand:

278 ml x 0.5 = 139g

222 ml x 0.95 = 211g

139 g + 211 g = 350g

I thought it would be:

15/35 x 350 = 150g of 50% alcohol

20/35 x 350 = 200g of 95% alcohol

Where does 278 and 222ml come from??????

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