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The pKa of:

NH4(+) = 9.4

NH3 = 38

NH2(-) = EXTREMELY HIGH (due to the the instability of compounds like NH(2-) and N(3-) the pKa values are not currently known -- they really aren't around for long enough to get an accurate pka value. There may be experimental values in the literature somewhere, but they are likely not going to be the same from source to source!)

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14y ago

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