Prelab for Electrolysis of Water

Prelab for Electrolysis of Water - Chemistry 112 Lab...

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Chemistry 112 Lab Section 005 November 19, 2014 Prelab for Electrolysis of Water 1. Why will K 2 SO 4 be used instead of KCl as the electrolyte? K 2 SO 4 will be used instead of the KCl because chloride ions are more easily oxidized than the oxygen in water molecules. For this experiment we want to use K 2 SO 4 to produce oxidized oxygen in order to create the electric current. We don’t want to us KCl because an undesired reaction will occur, which will create Cl 2 as a product. 2. When should the final volume of the gas in the tubes be recorded? The final volume of the gas in the tubes should be recorded ten minutes after I unplug the power supply for the electrolysis apparatus. 3. If your tube is red at the end of the reaction it means that the solution is acidic . 4. If there is a small bubble at the top of your tube before you start the reaction what
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Unformatted text preview: should you do? You should get rid of the bubble. I’m not sure exactly how you would get rid of the bubble, but it may be acceptable to take the tube out of the beaker and ±ll it up all the so that there is no air in in the tube and then put the tube back in the beaker. . 5. In an experiment that takes 36 minutes and 37 seconds to complete at a current of 0.2 amperes, a volume of 32.3 mL of hydrogen gas is produced. Calculate z for the electrolysis of water. z = It 96,485 ( n ) n = volumecollected ( mL ) 26,300 ( mL mol ) Q = It n = 32.3 mL 26,300 mL mol n = 0.0012281369 mol Q = 0.2 A ∗ 2197 s Q = 439.4 C z = 439.4 C 96,485 ( 0.0012281369 mol ) z = 3.708117363 C mol z = 3.71 C mol...
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  • Spring '08
  • Chemistry, mol, Lab section, final volume

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