All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Science
Forensic Fancy (Posted on 2002-08-20) Difficulty: 4 of 5
You have a little beaker with an unknown amount of acid indicator solution in it. Over this beaker, you have a tube marked in ml. increments. This tube is marked backwards, it starts at 0 at the top and goes to 25 at the bottom. This tube contains 25ml. of hydrocloric acid (.01 concentration), which will drip out one drop at a time into the beaker. The acid indicator will eventually turn magenta and you will then close off the tube.

On one such test you recorded that you started out with 10.2ml in the tube. You used it down to the 24.8ml area. At which time you refilled the tube to 12.1ml. You shut off the tube at 13.1ml, when the acid indicator was a nice shade of magenta.

Now, please give me the equation for how much acid indicator was in the beaker in mols, and use it to actually find how much was in it, also in mols. For bonus points, tell me how this equation would be helpful in certain forensic investigations.

You wouldn't think a 13 yr. old would want to put you through such a hard time of it, would you? ^_^

See The Solution Submitted by Hope    
Rating: 2.6250 (8 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Ummm... | Comment 3 of 15 |
(In reply to re: Ummm... by levik)

I think I'm going to have to abstain from this one for that reason (No offense, Hope, but there's just no way for me to be sure on this). However, I will comment that I don't think the problem is solvable without knowing the concentration of the acid.
  Posted by friedlinguini on 2002-08-20 04:26:28

Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (8)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information