Lisa W. answered • 10/01/15

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1 Liter = 1000 ml. To answer the question set up a ratio: Use X to be the amount of stock needed.

X/99 = 1000/5, then solve for X:

5x= 99, divide both sides by 5 and X = 19.8 ml of the 99% stock plus (1000 - 19.8 = 980.2) 980.2 ml of water to make 1 liter of 5% HCl.

Hope this helps! Best wishes.