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[HH]Spring Break Extra Credit

Blogs > Narrator
Post a Reply
Narrator
Profile Blog Joined June 2004
United States868 Posts
April 12 2008 18:25 GMT
#1
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.

***
Xiberia
Profile Joined September 2007
Sweden634 Posts
Last Edited: 2008-04-12 19:08:26
April 12 2008 19:06 GMT
#2
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.
drug_vict1m
Profile Blog Joined May 2007
844 Posts
April 12 2008 19:53 GMT
#3
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
One must feel chaos within, to give birth to a dancing star.
Narrator
Profile Blog Joined June 2004
United States868 Posts
April 12 2008 20:28 GMT
#4
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.
goldrush
Profile Blog Joined June 2004
Canada709 Posts
April 12 2008 20:36 GMT
#5
What colour was the message?
micronesia
Profile Blog Joined July 2006
United States24750 Posts
April 12 2008 20:43 GMT
#6
On April 13 2008 05:36 goldrush wrote:
What colour was the message?

I think he said it was a purple font.
ModeratorThere are animal crackers for people and there are people crackers for animals.
SpiritoftheTunA
Profile Blog Joined August 2006
United States20903 Posts
April 12 2008 21:20 GMT
#7
its gotta be phenolphthalein, colorless indicator that turns fuchsia with pH over 8ish
posting on liquid sites in current year
TheMusiC
Profile Joined January 2004
United States1054 Posts
April 12 2008 21:46 GMT
#8
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).
Narrator
Profile Blog Joined June 2004
United States868 Posts
Last Edited: 2008-04-12 22:05:32
April 12 2008 22:04 GMT
#9
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!"
Bond(i2)
Profile Blog Joined June 2006
Canada926 Posts
April 12 2008 22:51 GMT
#10
why would u tell ur teacher that u asked other people for the answer...
roses are red violets are blue, Im schitzophrenic and so am i
LuMiX
Profile Blog Joined October 2006
China5757 Posts
April 13 2008 00:09 GMT
#11
hes honest unlike some people...
Ecael
Profile Joined February 2008
United States6703 Posts
April 13 2008 00:52 GMT
#12
Just an extra credit, I think the teacher will probably laugh it off. Not to mention it is a HS assignment to boot.
micronesia
Profile Blog Joined July 2006
United States24750 Posts
April 13 2008 02:11 GMT
#13
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.
ModeratorThere are animal crackers for people and there are people crackers for animals.
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