A sample of Al203 with an available surface area of 871 m2 is suspended in 148 mL of 0.01 M KNO3. The sample is titrated with 12.7 mL of 0.116 M KOH. A blank (in the absence of Al2O3) requires 0.27 mL of the same KOH. Calculate the change in surface charge, in uC.cm2

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