Coulometric Titration of Sodium Thiosulfate with Iodine

In this experiment you will determine the concentration of Na2S2O3 present in a solution. You will place a known number of drops of this solution into a vessel, and then add to this an excess of potassium iodide (KI) and a few drops of starch solution. Two electrodes will then be inserted into the solution and the electrodes will be connected to a variable voltage source (9V battery and a potentiometer, see Figure 1). A milliameter (mA) will also be included in the circuit to measure the current.

Kit contains enough materials for 15 groups.

Kit Includes:

• 2 x 50 ml Sodium Thiosulfate, 0.001M Solution
  
• 1 x 15 ml Potassium Iodide, 0.1% Solution
  
• 1 x 10 ml Starch, 1% Solution
  
• 4 x 25 ml Sulfuric Acid, 1.0M Solution UN2796
  
• 30 Vials
  
• 30 3-Hole Plastic Lids
  
• 15 Drop-Burettes
  
• 15 Plastic Pipettes
  
• 60 Electrodes
  
• 15 Microspatulas
  
• 60 Electrical Connecting Wires
  
• 15 Comboplates

DOT: Small quantity exemption 173.4. THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only

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