/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q13P Electroplating efficiency. 56Nic... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 17: Q13P (page 428)

Electroplating efficiency. 56Nickel was electrolytically plated onto a carbon electrode from a bath containing290g/LNiSO4.6H2O,30g/LB(OH)3androle="math" localid="1654763379590" 8g/LNaClat-1.2VvsAgAgClThe most important side reaction is reduction ofH+toH2.In one experiment, a carbon electrode weighing0.4775gbefore deposition weighedrole="math" localid="1654763622546" 0.4798gafter8.82Chad passed through the circuit. What percentage of the current went into the reactionNi2+2e-鈫�Ni(s)?

Short Answer

Expert verified

The percentage of the current that went into the reaction isw=93.57%

Step by step solution

01

Electroplating efficiency:

Current efficiency may be used to calculate the amount of metal deposited at the cathode or dissolved at the anode under conventional electroplating circumstances. Cathode efficiency is current efficiency applied to the cathode reaction, whereas anode efficiency is current efficiency applied to the anode reaction.

02

Calculate how much Ni is deposited:

First we need to calculate how much is deposited:

m(Ni)=(0.4798-0.4775)g=2.3.10-3g

Then we calculate of Ni:

n(Ni)=m(Ni)M(Ni)=2.3.10-3g58.69g/moln(Ni)=3.92.10-5mol

03

Find he percentage of the current that went into the reaction is:

Now we calculate charge of Ni:

q(NI)=n(Ni).F.Zq(Ni)=3.92.10-5mol.96485C/mol.2q(Ni)=7.562C

The percentage of the current that went into the reaction is:

w=7.562C8.082C.100%W=93.57%

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

(a) Explain the difference between charging current and faradaic current.

(b) What is the purpose of waitingafter a voltage pulse before measuring current in sampled current voltammetry?

(c) Why is square wave voltammetry more sensitive than sampled

current voltammetry?

Consider the following electrolysis reactions.

Cathode:H2O(l)+e-鈬�12H2(g,1.0bar)+OH-(aq,0.10M)

Anode:Br-(aq,0.10M)鈬�12Br2(l)+e-

  1. Calculate the voltage needed to drive the net reaction if current is negligible.
  2. Suppose that the cell has a resistance of2.0惟 and a current of 100 mA. How much voltage is needed to overcome the cell resistance? This is the ohmic potential.
  3. Suppose that the anode reaction has an overpotential of 0.20 V and that the cathode overpotential is 0.40 V. What voltage is needed to overcome these effects combined with those of parts (a) and (b)?
  4. Suppose that concentration polarization occurs [OH-]s. at the cathode surface increases to 1.0 M and[Br-]s at the anode surface decreases to 0.010 M. What voltage is needed to overcome these effects combined with those of (b) and (c)?

(a) How does the amperometric glucose monitor in Figure 7-12 work? b) Why is a mediator advantageous in the glucose monitor? c) How does the coulometric glucose monitor in Figure 17-14 work? (d) Why does the signal in the amperometric measurement depend on the temperature of the blood sample, whereas the signal in coulometry is independent of temperature? Do you expect the signal to increase or decrease with increasing temperature in amperometry?

(e) Glucose(C6H12O6$,FM180.16)is present in normal human blood at a concentration near 1g/L How many microcoulombs are required for complete oxidation of glucose in 0.300渭L of blood in a home glucose monitor if the concentration is 1.00g/L ?

The cyclic voltammogram of the antibiotic chloramphenicol (abbreviated) is shown here. The first cathodic scan goes from 0 to -1.0 V. The first cathodic wave, , is from the reaction RNO2+4e-+4H+鈫�RNHOH+H2O. Peak B in the reverse anodic scan could be assigned to RNHOH鈫�RNO+2H++2e-. In the second cathodic scan from +0.9 to -0.4 V, the new peak C appears. Write a reaction for peak C and explain why peak C was not seen in the initial scan.


Cyclic voltammogram of 3.7 脳10-4 chloramphenicol in 0.1 M acetate buffer, pH 4.62. The voltage of the carbon paste working electrode was scanned at a rate of 350 mV/s. [Data from P. T. Kissinger and W. R. Heineman, 鈥淐yclic Voltammetry,鈥� J. Chem. Ed. 1983, 60, 702.]

What cathode potential (versus S.H.E.) is required to reduce 99.99%of cd(II) from a solution containing 0.10Mcd (II) in 1,0M ammonia if there is negligible current? Consider the following reactions and assume that nearly all (II) is in the form Cd(NH3)42+

localid="1663647104121" Cd2++4NH3鈬�Cd(NH3)42+尾4=3.6脳106Cd2++2e-鈬�Cd(s)E掳=-.402V
See all solutions

Recommended explanations on Chemistry Textbooks

Organic Chemistry

Read Explanation

Making Measurements

Read Explanation

Kinetics

Read Explanation

The Earths Atmosphere

Read Explanation

Inorganic Chemistry

Read Explanation

Chemical Reactions

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.