Electrochemical Cells

Question 1

Method to measure the EMF of an electrochemical cell of copper and Zn

Answer 1

Cu cell: place a piece of clean copper into a 100cm3 beaker of 1moldm-3 CuSO4 solution

Zn: place a piece of clean zinc into a beaker of 1 moldm-3 ZnSO4 solution

Prepare salt bridge by placing paper into a saturated NaCl solution and place each end in each beaker

Connect voltmeter to each piece of metal using crocodile clips

Measure and record EMF

Question 2

Hazards of measuring EMF

Answer 2

ZnSO4: threat to environment
Dangerous if inhaled or in eyes and skin

NaCl: irritates eyes

FeSO4 can affect liver
CuSO4 is an irritant to eyes and causes nausea

Question 3

How to reduce risk of measuring EMF

Answer 3

Goggles
Don’t eat or drink or inhale
Wash hands
Call poison control if ingested

Question 4

Disposal procedure for chemical in electrochemical cell

Answer 4

Use waster disposal service (don’t pour down sink