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Your stock is a bit more than twice as concentrated as your target concentration. Take 49.45 ml of the stock and mix with enough water to bring it up to 100 ml.

Now, the foregoing, notwithstanding, you want to prepare 100 ml...The precision of that measurement is going to drive your final results. It has only one significant digit so, your adding a quantity of stock with 4 significant digits (49.48 ml) is way too precise to be relevant. This is where you say, "I need to cut the concentration by about half so, I'll take 50 ml of the stock and add 50 ml of water. Sort of like how Justin Wilson measured ingredients for cooking.

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Q: What volume of the 0.91 percent with NaCl is needed to prepare 100 ml of 0.45 percent with NaCl?
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