100.0 ml of a solution containing 0.200 M NaNO2 is titrated with 0.100 M HCl. Which of the following statements is incorrect? Ka for HNO2 is 5.6 × 10–4.  Group of answer choices The initial pH (before adding HCl) is above 7.00. At the half equivalence point the pH is 3.25. The total volume of solution at the equivalence point is 200.0 ml. The pH at the equivalence point is 2.23. When 50 mL of HCl solution has been added, the solution is a buffer.

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.