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= 17,1 / (137 + 32 + 2)
=17,1/171
=0,1 mol
M= mol/ volume
= 0,1 / 0,25
=0,4 M
OH= 4.10^-1
POH = - log (4. 10^-1)
=1 - log 4
PH= 14 - POH
= 14 -( 1-log 4)
= 13 + log 4