Asked by PreMed33
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? (density of chromium is 7.19g/cm^3)
Answers
Answered by
DrBob222
Cr2O7^2- + 14H^+ ==> 2Cr(s) + 12e + 7H2O
The 0.25m^2 is 25 cm x 25 cm x 1.0E-4 cm thick for volume of 0.625 cc but you should confirm that.
mass Cr = 7.19 x 0.625 = estimated 4.5 g.
96,485 coulombs will plate one (1) equivalent weight of Cr which is 52/6 g Cr or about 8.7 g but you should be more accurate. (2 Cr for 12e makes 1 Cr for 6e.)
96,485 x (8.7/4.5) = ? coulombs.
amperes x seconds = coulombs. Substitute and solve for time.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.