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mol H2SO4 = 150 ml x 0,2 = 30 mmol
mol NaOH = 100 x 0,5 = 50 mmol
mol OH- sisa = 20 mmol
[OH-] sisa = 20 mmol/250ml = 0,08
pOH = - log [OH-] = - log 8 x 10⁻² = 2 - log 8 = 2 - 0,9 = 1,1
pH = 14 -1,1 = 12,9