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Hi all,

I need to dilute both Ferric III Nitrate and Potassium Thiocyanate from 0.1M to 0.0020M
I'm no mathematician.......can someone give me the simple answer , pleeeeease?!!!

Solution dilution calculator https://www.sigmaaldrich.com/AU/en/supp ... calculator

Use the formula
C1 x V1 = C2 x V2
where C is the concentration and V is the volume, 1 is the first solution and 2 is the second

So if you wanted to prepare 100ml of 0.002M solution from a 0.1M solution
V1 = (C2 x V2) / C1
= (0.002M x 0.1L) / 0.1M
= 0.002L which is 2ml
So pipette 2ml of the 0.1M solution into a 100ml volumetric flask then make up with distilled water to the mark

Hope this makes sense...

Or take 20mL of 0.1M and dilute to 1L

Marama T,

Thank you so much!!!!

This is another one I use, even the different styles of graph paper are good

https://www.graphpad.com/quickcalcs/molarityform.cfm

Oh I like yours better, Macca. Thanks.