The concentration of solutions. If you need this, you know how it works.
--
(grams of solute) = (molality)(molar mass)(Kg solvent)
(grams of solute) = (molarity)(molar mass)(L solvent)
--
-- Molality --
:Menu("Unknown:","M",1,"Mol.Mass",2,"Kg Solvent",3,"Grams",4)
:Lbl 4
:Input "M: ",M
:Input "Molar Mass: ", G
:Input "Kg Solvent: ",K
:(MGK)→A
:Disp "Grams:",A
:Goto 99
:Lbl 3
:Prompt G,M
:Input "Mol.Mass",N
:(G)/(MN)→K
:Disp "Kg:",K
:Goto 99
:Lbl 2
:Prompt G,M,K
:(G)/(MK)→N
:Disp "Molar Mass:", N
:Goto 99
:Lbl 1
:Prompt G,K
:Input "Mol.Mass",N
:(G)/(NK)→M
:Disp "M",M
:Goto 99
:Lbl 99
-- Molarity --
:Menu("Unknown:","M",1,"Mol.Mass",2,"L Solvent",3,"Grams",4)
:Lbl 4
:Input "M: ",M
:Input "Molar Mass: ", G
:Input "L Solvent: ",L
:(MGL)→A
:Disp "Grams:",A
:Goto 99
:Lbl 3
:Prompt G,M
:Input "Mol.Mass",N
:(G)/(MN)→L
:Disp "L:",L
:Goto 99
:Lbl 2
:Prompt G,M,L
:(G)/(ML)→N
:Disp "Molar Mass:", N
:Goto 99
:Lbl 1
:Prompt G,L
:Input "Mol.Mass",N
:(G)/(NL)→M
:Disp "M",M
:Goto 99
:Lbl 99
And what is the best way to calculate Molality
ReplyDeleteThe best way would be to use the program. Or you can follow the calculator on that site. Molality is a mol/mass ratio of solute to solvent, so as long as you have the right units, you can do it any way you'd like. I would say that mols/mass would be simpler, but in the real world you most likely know your substance and you can measure its mass, so that it was I split it like so.
DeleteAnyways, the best way is the way with which you are most comfortable