Calculate the alkaline strength of pearl ash ( impure potassium carbonate) in terms of percent K2O from the following data: Sample=0.3500 g; HCl used=48.03 m; NaOH used for back titration=2.02 mL; 1.000 mL HCl = 0.005300 g Na2CO3; 1.000 mL NaOH = 0.02192 g KHC2O4·H2O

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