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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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juliaanne82 juliaanne82
wrote...
Posts: 7
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11 years ago
I need the ph of:
aqueous Sodium Chloride, aqueous sodium monohydrogen phosphate, and aqueous aluminum chloride.  All have a concentration of .15 M

THANKS
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wrote...
#1
11 years ago
Hi,


1/ aqueous Sodium Chloride :
- - - - - - - - - - - - - - - - - - - - - - -

pH = 7



2/ aqueous aluminum chloride :
- - - - - - - - - - - - - - - - - - - - - - - -

pH = 7



3/ aqueous sodium monohydrogen phosphate :
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

pKa = 12,3

pH = 7 + 0,5pKa  + 0,5logC

pH = 7 + 0,5 x 12,3 + 0,5 x log( 0,15)

pH = 12,7
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