Baking soda is the general name for sodium bicarbonate (NaHCO3). A 0.2087g aliquot of a commercial baking soda product was treated w/25mL of 0.1028M HCL and after that back titrated to give an end point at 2.53ml during the addition of 0.0565M NaOH. Explain what is the purity of the baking soda?