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Discussion Starter · #1 ·
Can dry KH2PO4 powder go stale after about 8_10 years?
I added about a pinch of it in about 50_100 ml of water and my Salifert PO4 (not expired) test kit was showing 0.
 

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If it was stored appropriately in a cool and dry environment, I don't think it will decompose.

When using the test kit, did you make sure to shake all the reagents very well prior to use?
 

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Discussion Starter · #3 ·
i did stored in the dry and cool environment. Powder looks good.
I did shacked everything as per instructions. Maybe 1 smidgen of KH2PO4 is too little to show anything. I don't have a small scale to weight it :(
 
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