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A 50.0 mL sample of 0.10 M HNO2 (Ka = 4.0 x 10-4) is titrated with 0.12 M NaOH. The pH after 25.0 mL of NaOH is have been added is ___ a. 10.43 b. 7.00 c. 6.57 d. 3.57 e. none of these I need help understand the steps to solving this problem based on acid base equilibria