Purification of Copper

Question 1

Pure Cu is connected to

Answer 1

the cathode (-)

Question 2

Impure Cu is connected at

Answer 2

anode (+)

Question 3

Increase in size and mass

Answer 3

cathode (-)

Question 4

the anode (+) 
\_\_\_\_\_\_ in size and mass

Answer 4

Decreases

Question 5

Ionic equation in cathode (-)

Answer 5

Cu2+ (aq) + 2e- = Cu (s)

Question 6

Ionic equation in anode (+)

Answer 6

Cu (s) = Cu2+ (aq) + 2e-

Question 7

Impure copper is extracted from the ore. The copper is refined by electrolysis.
Name a suitable electrolyte.

Answer 7

Aqueous copper sulfate

Question 8

Impure copper is extracted from the ore. The copper is refined by electrolysis.
Name the material used for the negative electrode (cathode)

Answer 8

Pure copper (Cu)

Question 9

Impure copper is extracted from the ore. The copper is refined by electrolysis.
Write an ionic equation for the reaction at the negative electrode

Answer 9

Cu2+ (aq) + 2e- = Cu (s)