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A sample contains both NaOH and NaCl. 0.500 g of this sample was dissolved in water...

A sample contains both NaOH and NaCl. 0.500 g of this sample was dissolved in water to make a 20.0 mL solution and then this solution was titrated by 0.500 mol/L HCl solution. If 16.1 mL of HCl was used to reach the end point, what is the mass % of NaOH in the sample?

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