The ideal titration volume is between 35 and 50 mL since this uses most of the v

Question

The ideal titration volume is between 35 and 50 mL since this uses most of the volume of a 50 mL buret without going over. Achieving a larger titration volume (35 mL to 50 mL) instead of a small titration volume (say 10 mL) reduces contributions of small errors such as misreading a buret. An experiment to verify the hypochlorous acid content in a commercial brand of bleach requires titration of a certain volume of bleach with a solution of iodide. HOCl(aq) + H + (aq) + 3I (aq) I 3 (aq) + Cl (aq) + H 2 O(l) a) If the manufacturer states that the bleach is 5.5% HOCl by volume , what volume of bleach sample should be titrated with 1.525 M sodium iodide solution to provide an acceptable titration volume at the equivalence point? You may require additional data which can be accessed through online sources or the CRC handbook (give references). b) How would you dispense this particular volume? (what type of glassware would you use?) Briefly explain

Explanation / Answer

the volume of bleach sample used would depend on the volume of the sodium iodide solution initialli present.

Assuming the volume of the sodium iodide solution is V1

so the number of moles of NaI = V1*1.525

so the number of moles of HOCl=(1/3)*V1*1.525

=0.508V1

since the concentration is 5.5% by volume,

the molarity of the solution = (55/52.5)

=1.047 M

so volume of HOCl = 0.508V1/1.047

b) i will use a burette to get the result since this will minimize the error since the concentration is less.

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