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Originally Posted by Theodoric
It needs to be diluted by a factor of of 50/2.5 = 20. 1/20 of 100 is 5. So, take 5 ml of the 50 ppm solution and dilute to 100 ml.
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5ml of 50ppm solution = 5/1000 x 50 mg = 0.25mg
you are correct - my .005 was in kg/litres, not ml
- can I have marks for my 'workings out'
