From: tfalcone@comcast.net
Date: Tue Feb 04 2003 - 19:10:02 EST
Thanks that is good! Tina Falconer
----- Original Message -----
From: "Hauser, Michael" <MHauser@stlcc.edu>
To: <channel-talkchemistry@learner.org>
Sent: Tuesday, February 04, 2003 1:31 PM
Subject: RE: [Channel-talkchemistry] Workshop Video 2
> 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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