APPRATUS 25 and 100 cm3 pipettes 50 cm3 burette Icm3 graduated pipette 250 and 500 cm3 Erleners Stop watch Thermometer C

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Appratus 25 And 100 Cm3 Pipettes 50 Cm3 Burette Icm3 Graduated Pipette 250 And 500 Cm3 Erleners Stop Watch Thermometer C 1 (88.77 KiB) Viewed 57 times

APPRATUS 25 and 100 cm3 pipettes 50 cm3 burette Icm3 graduated pipette 250 and 500 cm3 Erleners Stop watch Thermometer CHEMICALS Starch indicator 001M sodium thiosulphate solution DIM KL Solution 01MK SO, solution The Kland K:S:O solutions must be made up fresh at the beginning of the experiment PROCEDURE Pipette 100cm) of the OIM K solution into a beaker and 100cm3 of the OIMKS,O, solution into another beaker or Erlenmeyer Black large enough to hold 200cm3 Pour the Kl solution into the K SO, solution. Stir the solution thoroughly noting the time of mixing and allow the reaction to proceed at room temperature (The colour soon becomes yellow, then brownish, due to the liberation of iodine) At five minutes intervals pipe out 25cmof the reaction mix with 25cm3 of ice cold distilled water and titrate it as fast as possible with 001M sodiunthiosulphate solution (50cm3 burette) using starch near the end point. Continue the titrations for 35 minutes. Repeat the a above, but take proper volumes of 0.1M KLand O IMKSO, solutions to give 0 02M solutions of each when they are mixed with distilled water and brought to a total volume of 200cm3 Titrate 25cm3 samples taken at ten minutes intervals for about an hour The results are to be displayed as follows: Time, 1 х 2 3 man 22 ES