Guy,
You sure you want to divide? I think you need to multiply: 40mg/l*23
L*.57 or around 1/2 g.
Joe

guy wrote:
> pp wrote:
> > On Jan 11, 2:39 am, "Pino" > wrote:
> > > How does one calculate how to add 20-40ppm of SO2?
> >
> > Guy's answer gives you the exact amount.
> > Pp
>
> Wrong pp! I gave the right solution but the wrong answer.
> For 23 liters, to get 40 ppm (parts per million) =
> (40 mg/l x 23 l)/(0.57) = 1614 mg or 1,61 grams of potassium
> metabisulphite salt.
>
> Easier solution is 40g x 23 l /570 = 1,61 g
>
> Guy