Why is only one hydrogen atom acidic in KHP?
Answer:
Potassium acid phthalate (KHC8H4O4) is the mono potassium salt of the dicarboxylic acid phthalic acid. Since one of the acidic hydrogens has been neutralized to form the potassium salt, only one acidic hydrogen remains. I can't draw the structure of phthalic acid here, but this formula and the equation for the formation of KHP from phthalic acid may help:
o-HOOC-C6H4-COOH + KOH --> KOOC-C6H4-COOH + H2O
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