Need 0.9g in 100mL and I have got a solution of 4.5g in 100mL.
Half of the 4.5% solution would be 2.25g in 50mL and half again would be 1.125g in 25mL.
If I were to put 25mL of the 4.5% solution into the 100ml WFI I would have 1.125g in 125mL (thinking back - I need 0.9g in 100mL) this is near enough what I want.
I did check with a calculator 1.125g/125mL = 0.9g/100mL
Could you add another 100-150mL to an expandable 100mL bag of WFI so they would seem poor choices. Therefore there is really only a couple of sensible answers and that would reduced it from a 1:5 guess to a 50:50 choice. So, even if you can't do the maths, you can still have a sensible guess.
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