1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a

Question

1. A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.3995 g is dissolved in water and used to standardize a solution of potassium hydroxide. An endpoint is reached when 25.53 mL of potassium hydroxide has been added. Determine the molarity (in mol/L) of the potassium hydroxide solution. Report your answer to four significant figures. ---------------- 2. The standardized potassium hydroxide solution is then used to titrate 33.99 mL of a solution of hypochlorous acid (HClO). An endpoint is reached when 25.29 mL of potassium hydroxide has been added. Determine the molarity (in mol/L) of the hypochlorous acid solution. Report your answer to four significant figures.

Explanation / Answer

number of moles of potassium hydrogen phthalate=0.3995/204.22=1.956 milli moles...molarity=1.956/25.53=0.077 M....(2)number of moles of potassium hydroxide =25.29*0.077=1.947 milli moles...molarity=1.947/33.99=0.057 M

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