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Re: [APD] Using Sulphate of Potash in my tank
Fertilizer bags in the US state the source or composition of the fertilizer
on the label. This is the way to tell what chemical or mineral is used as
the source of the fertilizer.
Some math for anhydrous Potassium Sulphate, K2SO4:
2 x K: (39.0983)(2) = 78.1966
1 x S: (32.06)(1) = 32.06
4 x O: (15.9994)(4) = 63.9976
78.1966 / (78.1966 + 32.06 + 63.9976) = 0.4488 or 44.88 percent by weight
Potassium in anhydrous pure Potassium Sulphate.
I have read different values for the percent of Potassium in Potassium
Sulphate, and I don?t understand why there are differences, unless it is the
purity of the salt. I have checked my math several times and don?t find a
mistake. Potassium oxide is 83.01 percent Potassium by weight.
Date: Sat, 20 Sep 2008 14:58:42 +0100
From: Stuart Halliday <stuart at mytriops_com>
Subject: Re: [APD] Using Sulphate of Potash in my tank
My potash product says:
Analysis: Potassium Oxide (K2O) Soluble in water, 48.0% (39.9% K)
200 Million years in the making...
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