The problem given is:
You have ben given 4 black pens. Design and carry out an experiment thatwill determine if the dye used in each pen is a compound or a mixture. You will need to provide evidence to justify your conclusions.
2006-09-17 15:22:24 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Paper or Thin Layer Chromatography (TLC) would be the easiest.
I would set up several sheet and mark the starting point for all four pens at the starting line (just above the liquid level of the Chromatography jar. Allow the ink to dry. Use a different solvent system in each jar.
If the ink spot travels in all the systems as a single dot (even if it smears), then the dye is a compound. If the ink separates in any jar, then you can count the number of dyes that were used.
Check out the references:
2006-09-17 15:27:01 · answer #1 · answered by Richard 7 · 68⤊ 0⤋
Paper chromatography.
What you want to do is get a strip of paper and with the pen put a spot of ink on one end of the paper. Suspend this strip of paper in a glass or jar with water in the bottom of it. Make sure the water is touch the bottom of the strip on the end with the ink spot. The water will gradually move up the strip of paper and you should see different colors moving up the paper with the water.
2006-09-17 22:34:08 · answer #2 · answered by Shaun 4 · 0⤊ 0⤋
I think I would tape the pens to the fan blade in my car and run it for ten minutes to see if the liquid separates. I don't think this speed would break a chemical bond, but I think I would use some really good tape.
2006-09-17 22:31:31 · answer #3 · answered by bill h 1 · 0⤊ 0⤋
just do a thin layer chromatography....
if the result has many spots (there are separation) then it is mixture
if there's no separation happened then is only a compound....
best answer?
2006-09-17 22:28:27 · answer #4 · answered by teroy 4 · 0⤊ 0⤋