USING THE RATIO FOR THE EXAMPLE
AN ADDITIONAL PIECE OF INFORMATION IS THAT
[K]OUT = [total K] - [K]IN
WHERE [total K] IS THE TOTAL AMMOUNTOF K IN THE TWO LITER VOLUME, PER UNIT VOLUME
USING THIS GIVES THE RESULT
[K]IN = [total K]2 /( 2[ total K] - P)