What is the pKa of KH2PO4?
|Compound||Formula||pKa at 20 °C|
|Potassium Phosphate, monobasic||KH2PO4||7.21|
|Potassium Phosphate, dibasic||K2HPO4||7.21|
What is the pKa of methyl?
Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1.
What is the pKa of HBr?
Hydrobromic acid (HBr): pKa = -8.7.
How are phosphorous acid and phosphonate salts related?
Phosphonic acids and derivatives are chemically and structurally related to phosphorous acid. Phosphonate salts are the result of deprotonation of phosphonic acids, which are diprotic acids:
What makes up the pKa vaules at 25o CA?
Diethyl malonate 12.9 Guanidinium ion 13.6 Cyclopentadiene 15.0 Water 15.74 Ethanol 16.0 Cyclohexanone 16.7 Acetamide 17 Isopropanol 17.1 t-Butanol 18.0 Acetone 19.3 Ethyl acetate 25 Ethyne 25 Acetonitrile 25 Dimethylsulfone 28 Diemthylsulfoxide 35 Ammonia 36 Diisopropylamine 40 Toluene 41 Benzene 43 Propene 43 Ethene 44 Methane approx. 60
What happens when dialkyl phosphonates are deprotonated?
In the Horner–Wadsworth–Emmons reaction dialkyl-phosphonates are deprotonated to give stabilized carbanions, which react with aldehydes to give E-alkenes with elimination of a dialkyl- phosphate. Compounds containing 2 geminal phosphonate groups are known as bisphosphonates.
How are phosphonates different from other chelating agents?
Phosphonates are highly water-soluble while the phosphonic acids are only sparingly so. Phosphonates are effective chelating agents. That is, they bind tightly to di- and trivalent metal ions, which is useful in water softening. In this way, they prevent formation of insoluble precipitates (scale).