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post #9 of (permalink) Old 08-26-2010, 12:39 PM
Darkblade48's Avatar
Join Date: Jan 2008
Location: Toronto/Singapore
Posts: 10,672
Dilutions do not work that way. You must take into account that by adding 40 mL of dilute water, you are changing the final volumes and concentrations. The proper way to calculate this:

(200 mL)(5 dkH) = (x dkH)(240 mL)

Solving for x = 4.167 dkH.


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