finishing.com -- The Home Page of the Finishing Industry

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
Live! From beautiful Pine Beach New Jersey: Welcome to the world's most popular metal finishing website

topic 17745

Water electrolysis project


2002

I am working on a water electrolysis project, and I need some information. How much hydrogen and oxygen are in a cubic meter of water. How many watts are required to convert this much water. After the hydrogen and oxygen are re-combusted how much water is there? how many btu's in this much hydrogen and oxygen.

John R
- Sudbury, Ontario, Canada


2002

John, our readers are usually more than willing to help students with their science projects, but we try to balance this with the pleas from teachers who ask us to please just tell the students to do their own homework.

All of the calculations will be worked from the weight (or mass) of the water. So, first, what is the weight or mass of that volume of water? What is the molecular formula for water? What are the atomic masses of hydrogen, oxygen, and water? Getting closer to an answer for your first question?

Your second question is the hard one. If you were provided with the factors you needed, how would you begin to approach it? I'd start with Faraday's Law.

If you don't know the answer to your third question, that is, if you've never heard of the law of conservation of mass, you don't belong in high school chemistry yet. Return to general science :-)

The fourth question is simply a matter of applying a conversion factor right? So what conversion factor are you looking for? I'll be happy to give it to you. Good luck.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


2007

I am actually performing electrolysis on salt water for my science fair demonstration. I have removed graphite rods from a battery, secured them to a lantern battery and then inserted them into saltwater covered with test tubes filled with water. I get hydrogen, no problem, but oxygen is proving tough.

The first time I had real erosion problems and the water turned blue. So, I removed the copper wiring attaching the graphite rod to the positive batter cable and changed to a "silver" wire. Now, I am getting a white, milky substance instead of oxygen. What am I doing wrong?

John Carlton P.
Jr. High Student - Sparta, NJ


June 15, 2009

while performing electrolysis of water by adding sulfuric acid in it and using graphite electrodes it was seen that at anode black powder sort of material was precipitated and at cathode maroonish coloured layer formed on graphite rod!
what is the black substance? is it carbon? can I titrate the solution?
and what is the maroon layer and by what machanism it is fromed?

Shashwat Sharma
hobbyist - Indore, MP, India



If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2019 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.