# Re: [APD] Need Help to Test my Test Kit

```The only issue I find is density of KNO3 is 1.04 mg/ml in my records. You
mention 1.069. Which is correct?.

Mariano

>From: Vaughn Hopkins <hoppy1 at surewest_net>
>Reply-To: aquatic plants digest <aquatic-plants at actwin_com>
>To: aquatic plants digest <aquatic-plants at actwin_com>
>Subject: Re: [APD] Need Help to Test my Test Kit
>Date: Fri, 21 Oct 2005 21:04:50 -0700
>
>Ok, here's my calculation:
>KNO3 = 1.069 gm/ml
>K = 39% of KNO3
>1 gal H2O = 3.77 liter = 3770 grams
>20ppm = 20/1000000 =2 x 10-5
>2 x 10-5 x 3770 gms (H2O) = .0754 gms (K)
>.0754/.39 = .1933 gms KNO3
>.1933/1.069 = .181 ml of KNO3
>1 tsp = 4.93 ml
>.181/4.93 = .037 tsp KNO3, which is a little more than 1/32 of a tsp.
>Therefore:  about 1/32 tsp of KNO3 (from Greg Watson) in a gallon of
>distilled water will give about a 20 ppm solution. (Actually, it gives
>17 ppm, if you could measure 1/32 accurately.)
>
>Who wants to correct my errors?
>
>Vaughn H.
>
>On Friday, October 21, 2005, at 06:18 PM, Charlie wrote:
>
> >
> > Can anyone offer advice on preparing a control sample to test my K
> > test kit?
> > I know many of you are familiar with Seachem Flourish. I'm trying to
> > amount of Flourish or other suggested source of K to a gallon of
> > distilled
> > water to create a sample that should test at 20 ppm.
> > Chas.
> >
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>
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