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**To**:**Aquatic-Plants at actwin_com****Subject**:**Re: Can someone check my math?****From**:**Jerry Leong <jl86 at earthlink_net>**- Date: Tue, 10 Apr 2001 13:13:21 -0700
- References: <200104101948.PAA14984 at actwin_com>

> > Date: Tue, 10 Apr 2001 07:47:04 -0500 > From: Stephen Boulet <stepheb at comm_mot.com> > Subject: Re: Can someone check my math? > > > Aaron Ivers wrote: > > > > > Subject: Can someone check my math? > > > I'm trying to introduce some more PO4 into my tank from AP's "pH Down", but > > > would like someone to check my calculations before I start. > > > The packaging says that it is 30% phosphoric acid. I'm assuming this to be > > > H3PO4 (which should be about 97% PO4). > > Sounds good. > > > > > Is it acceptable to assume that 1 mL of this stuff then represents (1000 mg > > > x 97% x 30%) or 291 mg of PO4? > > Also sounds good. Concentrated Phosphoric Acid is much denser than water (approx. 1.8(?) for a 97% concentration) - a 30% sol. is approx. 1.2. This means that unless your calculations include the differences due to the specific gravity and if you are using a volume measurement (ml), you'll be adding approximately 20% more phosphate than you think you're adding.

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