From: Hauser, Michael (MHauser@stlcc.edu)
Date: Tue Feb 04 2003 - 15:31:52 EST
You need a serial dilution, similar to what was shown in the video. You take
1 mL of first solution and add up to a volume of 10.0 ml with water. THEN
take 1 mL of THAT solution, and dilute it by 10:1. Dilute this new solution
in the same way, etc and each solution will be an order of magnitude more
dilute.
Michael Hauser
-----Original Message-----
From: MARTINA FALCONER [mailto:tfalcone@comcast.net]
Sent: Tuesday, February 04, 2003 7:17 AM
To: channel-talkchemistry@learner.org
Subject: Re: [Channel-talkchemistry] Workshop Video 2
If you are trying to show pH, wouldn't that mean the second dilution
would have to be 100 to 1, the third 1000:1 ? I think maybe that would
be too difficult to show that way - am I wrong? Tina
----- Original Message -----
From: "Hauser, Michael" <MHauser@stlcc.edu>
Date: Sunday, February 2, 2003 8:32 pm
Subject: [Channel-talkchemistry] Workshop Video 2
> Hello All-
> I enjoyed the demonstration by Pernell Williams regarding the
> dilution of
> food coloring. I do want to point out that students should be
> determining if
> the solutions are COLORLESS as opposed to CLEAR. These words have
> differentmeaning (Windex is blue color but is clear - you can even
> read the label
> through the back side of bottle). I am also curious why 5:1
> diliutions were
> used when a 10:1 dilution would be a great way to introduce the pH
> scale and
> log scale. Comments?
>
> Michael Hauser
>
>
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