Dilution series?
Can you tell me how to set up a five-step dilution series of table salt (w=0.1 to 1% NaCl) in drinking water?
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You first consider whether you want a linear series (0, 5, 10, 15,…) or a geometric (1, 2, 4, 8,…). Depends on what you have with the dilutions. In the narrow range from 0.1 to 1, the difference is not large.
Linear: You divide the range (0.9%) into 4 (five steps minus one) parts, add them to the previous concentration (starting with 0.1%) and turn out to be useful so that you come to the range 0.1%, 0.3%,…
However, making it into drinking water is strange, it already contains Na and Cl ions, usually so many (up to 0.05% NaCl) that they easily falsify your concentration series.