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26 January, 23:47

Nickel can be plated from aqueous solution according to the following half reaction. How long would it take (in min) to plate 29.6 g of nickel at 4.7 A?

Ni2 + (aq) + 2 e - - -> Ni (s) 3.5*10^2 min

(A) 5.9 * 10^2 min

(B) 1.7 * 10^2 min

(C) 6.2 * 10^2 min

(D) 4.8 * 10^2 min

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Answers (1)
  1. 27 January, 00:30
    0
    It take 3.5 * 10² min

    Explanation:

    Step 1: Data given

    Mass of the nickel = 29.6 grams

    4.7A

    Step 2: The balanced equation

    Ni2 + (aq - + 2e - → Ni (s)

    Step 3: Calculate time

    W = (ItA) / (n*F)

    ⇒ W = weight of plated metal in grams = 29.6

    ⇒ I = current in coulombs per second. = 4.7

    ⇒ t = time in seconds.

    ⇒ A = atomic weight of the metal in grams per mole. = 58.69

    ⇒ n = valence of dissolved metal in solution in equivalents per mole. = 2

    ⇒ F = Faraday's constant in coulombs per equivalent. F = 96,485.309 coulombs/equivalent.

    29.6 = (4.7 * t * 58.69) / (2*96485309)

    t = 20707 seconds

    t = 345 minutes = 3.5 * 10² min

    It take 3.5 * 10² min
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