Answer to Question #52018 in Physical Chemistry for tiff
The number of moles of NaOH is 0.01*0.15 = 0.0015 moles
The number o moles of HCI is 0.01*0.1 = 0.001 moles
The reactants react in the proportion 1:1, so the number of moles of NaOH which is left is 0.0015-0.001 = 0.0005 moles
The total volume of the solution is 20mL, or 0.02L.
So, the concentration of NaOH is 0.0005moles/0.02L = 0.025M
pOH = -log0.025 = 1.6
pH = 14 - 1.6 = 12.4
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