The relationship between the current and the amount of metal deposited at the cathode Essay

Custom Student Mr. Teacher ENG 1001-04 11 November 2017

The relationship between the current and the amount of metal deposited at the cathode

I. Design

Objective:

The purpose of this experiment is to determine the enthalpy change for the displacement reaction:

Zn(s) + Cu(aq) -> Cu(s) + Zn2+(aq)

Introduction

By adding an excess of zinc powder to a measured amount of aqueous copper (II) sulfate, and measuring the temperature change over a period of time, you can then calculate the enthalpy change for the reaction by the equation:

is the enthalpy change of reaction

is the mass of copper (II) sulfate

is the specific heat capacity of Copper (II) sulfate solution

is the mass of Zn powder

is the specific heat capacity of Zn

is the temperature change

The negative sign is present because the heat gained by the Copper (II) sulfate solution and Zinc is equal to the heat lost by the reaction. The reaction is exothermic and thus the sign would be negative.

Materials

* Safety glasses and lab coat

* Graduated Cylinder

* Analytical Balance

* Styrofoam cup

* Stirring rod

* Weighing Boat

* Beaker

* Spatula

* Zinc Powder

* 1.00 M CuSO4

* Vernier Labquest and Temperature Probe

* Retort Stand

* Utility clamp

* One hole stopper

* 25mL volumetric pipette

* magnetic stirrer

* stirring chip

Procedures

1. Set up Vernier Labquest with a temperature probe. Under âfile sensorsâ-> âdata collectionâ, enter 3s/sample and length=750s

2. Place a Styrofoam cup into a 600mL beaker. Measure out 25.0ml of 1.0M CuSO4 using a volumetric pipette into the Styrofoam cup

3. Use a utility clamp and a retort clamp to suspend the temperature probe. Lower the temperature probe into the solution.

4. Weigh out 6 grams of zinc powder in a weighing boat. There is no need to be accurate because the powder will be in excess.

5. Begin data collection, allowing the temperature probe to equilibrate for 90-120 seconds before adding the zinc.

6. Add zinc powder to the solution and use a stirring chip on a magnetic stirrer to stir the contents of the cupt until a maximum temperature has been reached

Free The relationship between the current and the amount of metal deposited at the cathode Essay Sample

A

  • Subject:

  • University/College: University of Chicago

  • Type of paper: Thesis/Dissertation Chapter

  • Date: 11 November 2017

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