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Too make a 4% solution of paraformaldehyde from a 20 % solution.

C1V1=C2V2
(20)(10ml)= (4)(x)
x= 50ml

so I would need to add 45ml of PBS and 4ml of the paraformaldhyde.

Is that right.

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You have a 20% solution of paraformaldehyde in what solvent?

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