pKa Table of Common acids

The correct answer and explanation is : In this titration, sodium hypochlorite (NaOCl), the sodium salt of hypochlorous acid (HOCl), is neutralized by hydrochloric acid (HCl). The reaction between NaOCl and HCl forms HOCl and NaCl: [ \text {NaOCl} + \text {HCl} \rightarrow \text {HOCl} + \text {NaCl} ] The pKa of HOCl is given as 7.530.. The pH after adding 6.47 mL of HCl is approximately 7.687, after adding 18.4 mL it is about 2.42, and at the equivalence point with HCl, the pH is approximately 7.530 due to the presence of the weak acid HOCl. This demonstrates the behavior of a weak acid and its conjugate base during titration.

Step 4: Since HOCl is a weak acid, we use the ionization constant to find [H+] and calculate pH: For HOCl at pKa = 7.53, the concentration of [H+] can be calculated.. Hypochlorous acid is an inorganic compound with the chemical formula Cl O H, also written as HClO, HOCl, or ClHO. [2][3] Its structure is H−O−Cl. It is an acid that forms when chlorine dissolves in water, and itself partially dissociates, forming a hypochlorite anion, ClO−.