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mol Naoh = 50 x 0,4 =20 mmol
mol H2s = 50 x 0,2 =10
ka=10 pngkt -7 sama saja 1 x 10 pngkt -7
pka=-log ka
=-log 1x10 pngkt -7
= 7-log 1
ph=pka-log a/g
=7-log 20/10
=7-log 10
=7-1
=6
mngkin itu yg bisa z krjakn..