A mixture contains Na2CO3, NaOH, and inert matter. A sample weighing 1.500 g requires 28.85 mL 0f 0.5000 M HCl to reach a phenolphthalein end point, and an additional 23.85 mL to reach a methyl orange end point. What is the percentage of NaOH in the sample? a. 8.5% b. 50.68% c. 6.67% d. 20.56% e. 84.27%

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