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Standard solution/pH buffer ---
Name Purity Unit package Shelf life Media
 potassium bitartrate  pH=3.587 25°C  500ml  2 months  water
 Potassium dihydrogen citrate  pH=3.776 25°C  500ml  2 months  water
 Potassium hydrogen phthalate  pH=4.008 25°C  500ml  2 months  water
 mixed phosphate I  pH=6.865 25°C  500ml  2 months  water
 mixed phosphate II  pH=7.413 25°C  500ml  2 months  water
 borax  pH=9.180 25°C  500ml  2 months  water
 carbonate  pH=10.012 25°C  500ml  2 months  water
 Potassium trihydrogen dioxalate  pH=1.679 25°C  500ml  2 months  water
 calcium hydroxide  pH=12.454 25°C  500ml  2 months  water
 sodium chloride-ammonium hydroxide  pH=7.00 25°C  500ml  2 months  water
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