Re: [GSAS-Member] Aquatic Plant Stuff & Gregg Watson Ferts

["SUSAN WELENOFSKY" <welenofsky@comcast.net>]

Thanks all chemistry folks! I'll do my homework now.

Susan

-----Original Message-----
From: gsas-member-bounces@thekrib.com
[mailto:gsas-member-bounces@thekrib.com] On Behalf Of Matt Staroscik
Sent: Friday, March 02, 2007 11:39 AM
To: Greater Seattle Aquarium Society member chat
Subject: Re: [GSAS-Member] Aquatic Plant Stuff & Gregg Watson Ferts

As a chemist, by schooling if not profession, I thank you for posting 
and saving me the time. :)

- Matt

On Fri, Mar 02, 2007 at 09:34:28AM -0800, Sanford, Dave   LHS-STAFF wrote:
> In the formula MgSO4 . 7 H2O, the 7 H2O refers to actual molecules of
water
> bound to each formula unit of MgSO4. These compounds are called hydrates.
> The crystals look and feel dry but the water is locked into the crystal.
If
> you heat a measured quantity of hydrate and then mass the anhydrate, it
will
> have a lower mass because the "water of crystallization is driven off.  As
a
> chemistry teacher I couldn't resist.
> dave
> 
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-- 
Matt Staroscik
matt@wrongcrowd.com | http://wrongcrowd.com
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