perplexus.info :: Science : pH of water again

pH of water again (Posted on 2003-02-15)

After your freakish friend (from the other pH problem) found out that it was carbon dioxide in the air that made his water acidic, he made sure that all his jars are air-tight and vacuumed out all the air in his jars immediately after the purification. How big of a freak is that?!

During one hot summer day, you and he just finished playing basketball. You went over to his house and again, he offers you a glass of his purified water. And to ensure that it's pure, he measures the pH of it right after he pours it out (so that it doesn't get in contact with the air too long).

And again, the pH of the water is not 7! What happened this time?

Submitted by np_rt

Rating: 3.6667 (6 votes)

Solution: (Hide)

The pH of water depends on the amount of ionization of the water, which in turn depends on the temperature of the water. It's only at a temperature of 25 degrees celsius and a pressure of 1 atmosphere (pressure doesn't really make any difference) that the pH of water is 7.
So this time, the water is indeed pure, just that the pH is different due to the different temperature.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Thoughts	K Sengupta	2023-03-27 09:57:45
a guess	logischer Verstand	2004-04-13 22:48:43
re: guess	Eric	2003-11-29 22:47:34
guess	calla tah-n	2003-05-23 10:37:13
Solution	Chaz	2003-05-03 09:57:33
re(2): Hint	Mike Convente	2003-02-28 13:56:28
re: Hint	Anoop	2003-02-15 19:00:13
Hint	np_rt	2003-02-15 18:25:41
just a guess	Kyle	2003-02-15 16:46:04

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