Prelab for Electrolysis of Water

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

Info icon This preview shows pages 1–2. Sign up to view the full content.

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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

  • Spring '08
  • LEMASTER
  • Chemistry, mol, Lab section, final volume

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern