Quantitative equilibrium calculations
Fundamentals
Problems
Fraction of atrazine Help Answer Retardation factor Answer Raining out Answer Carpet Help Answer Sorption kinetics Help Answer Organic pollutants in water Answer 
Fish toxicity test Answer Ethylacetate Answer Tetrachlorobenzene Answer Hexachlorobenzene Answer Chlorobenzene Answer Toxicity test Answer Toxicity test - improving... 3 phases problem Answer Sorption experiment Answer HCHExcercises for an improved intuitive understandingQuestions for recapitulation
Good to know
Minesweeper-problemsCarpet
A carpet lies in an empty room. The carpet emits a volatile chemical. The carpet weighs 200 kg and the room has a volume of 50 m3. The distribution coefficient at 25°C is Kcarpet / air = 10 000 (Lair / kgcarpet).
How often does the room need to be aired (by opening a window) to remove 50 % of the initially present volatiles from the carpet? Assume that (i) the entire air in the room is quickly and completely replaced by fresh air during airing, (ii) the temperature is constant at 25°C, and that (iii) the distribution of the volatile into the wall and the window is negligible, such that after each airing step re-equilibration between the air and the carpet occurs.
What would happen if the room was additionally equipped with armchairs, curtains, …? A qualitative answer suffices.
 |
Proceed |
 |