PRE lab chem - This contain the pre class material for the laboratory PDF

Preview

Summary

This contain the pre class material for the laboratory...

Description

AIM Investigation of the effect of temperature and the concentration on the voltage produced by a voltaic cell. EQUIPMENTS 4-Electrodes (2-Zinc sulfate, 2-copper sulfate) 2- 100 mL Beakers 1.0 M (sulfate or nitrate solutions of solutions of zinc, copper ) Rubber tubing Hotplate Distilled water A salt bridge(Filter paper strips) Voltmeter and connecting wires Steel wool or sandpaper 0.1 M potassium chloride SAFETY METHOD As every experiment this experiment also requires the involvement of proper appropriate attire to prevent accidents that can occur due to making substances such as chemicals coming into contact with the skin. The attire should be maintained along with goggles, lab coat, gloves and fully covered shoes. This experiment involves the use of zinc, copper and potassium chloride. When these substances come into direct contact with the skin it can create different skin irritations and even can create skin allergies. It is better if a hood can be used in order to prevent from inhaling harmful gases. This experiment involves the use of electrical current for the voltage measurements; therefore, it is better if the solutions and the electrical wires do not meet together if not it can create electric shorts. The high voltages released from the voltmeter can increase the risk of electric shock accidents inside the laboratory. PROCEDURE Take Solutions of copper sulfate and solution of Zinc sulfate into two different beakers The two cells were joined through a rubber tubing filled with Sodium sulfate until it reaches the maximum temperature. The two ends of the tube were rubbed with cotton wool or sandpaper to pass ions through solutions. The galvanic cell was placed on the hot plate and was heated up to 70°C approximately. The galvanic plate was turned off and was let to cool down. Before checking for the voltage, we should change the concentrations of the solutions to check for the effect of concentration on the solution. After the cell was cooled and the voltage was checked every 5°C using a multimeter and the temperature was marked using a thermometer immersed in a copper sulfate solution....