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Old 08-26-2010, 10:43 AM   #8
quatermass
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Quote:
Originally Posted by Darkblade48 View Post
As long as your initial calculation was correct, then your dilutions seem OK.

Your last dilution is incorrect, however.

To 200 mL of 5 dkH, adding 40 mL of distilled water will yield 240 mL of 4.16 dkH reference solution, not a solution of 4 dkH.
200 / 5 = 40 per 1 dKH.

What am I forgetting?
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