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So, right before Spring Break my teacher announced that we'd have no homework but we'd have a little extra credit assignment. He sprayed some dilute ammonia on some sheet of white paper. A hidden message appeared that read "EXTRA CREDIT" and a while later it disappeared. Apparently the paper is actually some special kind of paper that reacts to ammonia.
We're supposed to be able to figure this out with what we have in our textbooks/library. I actually thought Googling it would work but it just led to some other thing about hidden messages on Goldenrod paper, which is a little bit different.
He wants us to tell him what we think the paper has on/in it that caused the purple color/font. It has to be some specific chemical.
The other thing he wants to know is why did the color disappear after a while. (On the Goldenrod paper, the color goes away after adding vinegar or something...)
Thank you in advance.
 
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Phenolphthalein or BTB maybe? Or wait.. the color disappears after a while.. meh i fail at chemistry. GL!
Maybe it's the wrong colors too.. Ugh.
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Phenolphthalein.
and it disapeared because of evaporization.that's the only thing that can come to my mind atm.
i'll think about it later and report if find sth new out.
just tell me what school are you so i know the difficulty lvl of the question T_T
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On April 13 2008 04:53 drug_vict1m wrote:
Phenolphthalein.
and it disapeared because of evaporization.that's the only thing that can come to my mind atm.
i'll think about it later and report if find sth new out.
just tell me what school are you so i know the difficulty lvl of the question T_T
I am in high school, sophomore year.
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What colour was the message?
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United States24801 Posts
On April 13 2008 05:36 goldrush wrote:
What colour was the message?
I think he said it was a purple font.
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its gotta be phenolphthalein, colorless indicator that turns fuchsia with pH over 8ish
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On April 13 2008 06:20 SpiritoftheTuna wrote:
its gotta be phenolphthalein, colorless indicator that turns fuchsia with pH over 8ish
there's your answer, i remember specifically doing a lab on this my junior year of high school in AP chemistry. phenolphthalein is a very common pH indicator that turns purple when the solution turns basic (forgot what the specific pH level was, but it's mentioned in posts above).
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On April 13 2008 06:46 TheMusiC wrote:Show nested quote +On April 13 2008 06:20 SpiritoftheTuna wrote:
its gotta be phenolphthalein, colorless indicator that turns fuchsia with pH over 8ish there's your answer, i remember specifically doing a lab on this my junior year of high school in AP chemistry. phenolphthalein is a very common pH indicator that turns purple when the solution turns basic (forgot what the specific pH level was, but it's mentioned in posts above).
Thank you to everyone that replied, though these last two answers were the most descriptive.
I should just tell my teacher how I used the internet to find the answer. "I asked about it on TeamLiquid dot net!"
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why would u tell ur teacher that u asked other people for the answer...
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hes honest unlike some people... 
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Just an extra credit, I think the teacher will probably laugh it off. Not to mention it is a HS assignment to boot.
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United States24801 Posts
The way the assignment was assigned I don't think it really matters how he gets the info, although you should back it up with a bit of printed out research on the topic now that you know exactly what to look up.
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EPT
