# Chemistry - Electroplating - URGENT

posted by .

"To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat."

This is what I have so far-

96,485 coulombs are required to plate 1 Cr; 52/6 = 8.67g.

To plate 200g:
96.485 * (200/8.67) = 96.485 * 23.068 C = 2,225.721 coulombs
1 A = 1 C/s
(amperes) x (time) = 2,225.721 coulombs.

I know this may seem stupid but I can't seem to remember how to determine amps. Please help.

• Chemistry - Electroplating - URGENT -

I believe you should have divided 52 by 3; the electroplating probably goes from Cr^3+ to Cr which is a change of 3 electrons.
Then coulombs needed = 96,485 x (200/17.3) = ?
C = amps x seconds but you have two unknowns. You don't know amps (usually given in the problem) or seconds (which is what the problem is asking).

• Chemistry - Electroplating - URGENT -

Ahh thank you - so then there would be 8346.453 coulombs needed instead of 2225.721.

As there are two unknowns, I cannot solve this problem any further... this is for an assignment due tomorrow, what should I do?

• Chemistry - Electroplating - URGENT -

Sorry that should say 1115433.526 coulombs, not 8346.453.

## Similar Questions

1. ### chemistry

A car bumper is plated with chromium using chromium(III) ions in solution. If a current of 54 A flows in the cell for 45 min 30 s, determine the mass of chronium deposited on the bumper.
2. ### chemistry

A 7.500-mg sample of chromium-55 is analyzed after 14.0 min. and found to contain 0.469 mg of chromium-55. what is the half-life of chromium-55?
3. ### Chemistry

How does the process of chromium electroplating work?
4. ### Chemistry

How much time is required to electroplate 6.530 µg of chromium from a potassium dichromate solution, by using a current of 118 mA?
5. ### chemistry

a 7.500-mg sample of chromium-55 is analyzed after 14.0 min and found to contain 0.469 mg of chromium-55. what is the half-life of chromium-55
6. ### chemistry

Plastic articles can be chromium-plated by coating them with thin layer of graphite paste,placing them in a bath of aqueous chromium(III) sulphate and electroplating. a)Suggest a reason why the article is first coated with graphite. …
7. ### Chem

Electroplating is a widely used process. One of the most popular electroplating processes involves the plating of two metals, nickel and chromium, in separate vats. Nickel is plated first because it adheres better to iron, then the …
8. ### chemistry

To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat. need full explanation i did find this question …
9. ### CHEMISTRY

Chromium plating is done using a dichromate solution. How long would it take to plate 1.0x10-2mm thick onto a car bumper with surface area 0.25m^2 in a 25.0 Amp electrolytic cell?
10. ### chemistry

"To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. Determine how much time a standard bumper should be immersed in a chromium vat." This is what I have so far- 96,485 coulombs are …

More Similar Questions