Re: Making salt water

[Lucy Vaysman <lmail@TEACHERFOCUS.COM>]

Greetings!

There are two possible variations - ppm by volume or ppm by mass.  You will
have to find out which units have been used in the reference book you
mentioned.

a)ppm by volume means volume in milliliters per 1000 liters of sample;
b)ppm by mass means mass in milligrams per kilogram of sample.

I believe that in your case it's version (b) because salt (NaCl) is solid.
It means that your solution should contain 35000 mg or 35 g of salt per 1 kg
of solution.

To make this solution, you should mix 35 g of salt and
1000g - 35 g = 965 g water.

Hopefully this would help.

Sincerely,

Lucy Vaysman
Community Director
TeacherFocus.com
http://www.teacherfocus.com


----- Original Message -----
From: "Tina Fanetti" <FanettT@QUEST.WITCC.CC.IA.US>
To: <PHYS-L@lists.nau.edu>
Sent: Saturday, January 12, 2002 3:54 PM
Subject: Making salt water


> Okay
> I want to do an lab in which the students find the index of refractio=
> n of different liquids.
>
> I would like them to find the index of refraction of salt water..like=
>  the ocean salt water...
>
> I looked it up and sea water has 35,000 ppm of salt.
>
> How in the world do I make this useful...like you know in liters or s=
> omething
>
> Thanks
> Tina Fanetti
>
> Tina Fanetti
> Physics Instructor
> Western Iowa Technical Community College
> 4647 Stone Ave
> Sioux City IA 51102
> 712-274-8733 ext 1429