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NH3 goes to NH4 did it gain or lose a proton

User Valdo
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NH3 and NH4+ differ by a proton, which means that NH3 becomes NH4+ ion by gaining a proton, whereas the NH4+ ion becomes the NH3 molecule by losing a proton.
The species NH4+ and NH3 are a conjugate acid-base pair.
User Yinqiu
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