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    Types: TextFile
    Names: »js3«

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opløselighed med ionstyrke
begin
  real L,s,s1,I,LNL,f;
  integer ip,in,lp,LN;
   L:=readr(<:opl.produkt:>);
OM:
  lp:=readi(<:positiv ions ladning:>);
  LN:=readi(<:negativ  -      -:>);
  if LN<0 then LN:=-LN;
  if lp<=0 or LN=0 then
  begin
    write1(out,<:illegal ladning:>);
    goto OM
  end;
  if LN mod lp=0 then
  begin
    in:=1; ip:=LN//lp 
  end
  else
  if lp mod LN=0 then
  begin
    ip:=1; in:=lp//LN
  end
  else
  begin
  ip:=LN; in:=lp;
end;
  write1(out,<:sammensætning:  P:>,ip,<:  N:>,in,"nl",1);
  LNL:=ln(L/ip**ip/in**in)/(ip+in);
  f:=.509*ln10*(ip*lp*lp+in*LN*LN)/(ip+in);
  s:=0;
LL:
  I:=.5*(lp**2*ip+LN**2*in)*s;
  s1:=exp(LNL+f*sqrt(I));
  if abs(s-s1)>.001*s then
  begin
    s:=s1;
    goto LL
  end;
write1(out,<:opløselighed:>,s,<: mol/l:>)
end
  write1(out,<:opløselighed:>,s,<: mol/l:>)
end
▶EOF◀