Electroplating (learning Material Of Chemistry) By Hariyanto

ELE CTROP LA TING OF METALS BY HARIYANTO

CURRICULUM ANODE

CATHODE

INTRODUCTION (-)

(+)

ACCU

ELECTROPLATING Electrolyte solution

ELECTROPLATING OF COPPER ELECTROPLATING OF IRON CONCLUSION EXERCISE

LESSON PLAN

MA NEGERI 3 MALANG

QUIT

STANDARD OF COMPETENCY : To understand oxidation and reduction reaction and electrochemistry cell and also its application in technology and daily life

Basic competency : To observe redox reaction in electrolysis cell and apply faraday’s law

Indicator : To write electrolysis reaction in electroplating of metals

Purposes :

The audiences are able to : understand the process of electroplating describe how to plate metal by other metal arrange materials and substances of electroplating

MA NEGERI 3 MALANG

MENU

Electrochemistry : Electrochemistry is the branch of chemistry that studies about change of electrical energy to chemical energy or change of chemical energy to electrical energy

MA NEGERI 3 MALANG

MENU

Electrochemistry cell : Electrochemistry cell is cell that change the electrical energy to chemical energy or change the chemical energy to electrical energy Examples:

ACCUMULATOR

MA NEGERI 3 MALANG

BATTERY

ELECTROPLATING CELL

MENU

ELECTROCHEMISTRY CELL

VOLTA CELL

ELECTROLYSIS CELL

Canges the chemical energy to electrical energy

Canges the electrical energy to chemical energy

Ex : accu, battery

Ex : electroplating cell

MA NEGERI 3 MALANG

MENU

REDOX REACTION

OXIDATION Atom/substance releases electron Ex : Au (atom) → Au3+(ion) + 3e

MA NEGERI 3 MALANG

REDUCTION Atom/subtance gains electron Ex : Au3+(ion) + 3e → Au (atom)

MENU

Definition of electroplating Electroplating is process to plate metal by other metal with electrolysis

Purpose of electroplating The purposes of electroplating are protecting metal of corrosion and making performance of metal better Examples: We plate iron by chromium to make the iron resists corosion We plate copper ring by gold to make the ring looks better

MA NEGERI 3 MALANG

MENU

Arrangement of electroplating equipment ANODE CATHODE SOURCE OF ELECTRICITY CABLE

Source of electricity (-)

(+)

ACCU

MA NEGERI 3 MALANG

ANODE

switch

CATHODE Electrolyte solution

SWITCH ELECTROLYTE SOLUTION

MENU

ELECTROPLATI NG OF COP PE R ANODE GOLD

(-)

(+)

CLICK ON

ON OFF

ACCU

MA NEGERI 3 MALANG

CATHODE COPPER

Solution of AuCl3

ELECT ROP LAT ING OF CO PPE R CATHODE COPPER

ANODE GOLD

(-)

(+)

CLICK OFF

ON Cl

OFF

ACCU

MA NEGERI 3 MALANG

Cl

Cl-

Au3+Cl-

-

-

Cl-

Au3+ Cl-

Click circle Click circle

ELECTROPLATI NG OF COP PE R ANODE GOLD

(-)

(+)

CLICK ON

ON OFF

ACCU

MA NEGERI 3 MALANG

CATHODE COPPER

Solution of AuCl3

ANOD E ( OXIDA TION REACTI ON ) ANOD E OF G OL D

MA NEGERI 3 MALANG

REACTION:  Gold ( Anoda ) : Au(s)

Au3+(Aq) +

3e ( oxidation )

Notes : Atom of Au ion of Au 3+ Ion of Cl Electron

Back

C AT H OD E (REDU CTION REACTI ON ) REACTION :

CATHODE OF COPPER

MA NEGERI 3 MALANG

 Copper ( Cathoda ) : Au3+(Aq) + 3e

Au(s) ( Reduction )

Notes Atom of Au Ion of Au 3+ Ion of Cl Electron MENU

Back

Anode Perak

(-)

(+)

CLICK ON

ON OFF

ACCU

MA NEGERI 3 MALANG

Katode Besi

Cathode

Anode Silver

(-)

(+)

CLICK OFF

ON OFF

ACCU

MA NEGERI 3 MALANG

Iron

NO3

Ag+NO3NO3-

NO3-

Ag+

NO3-

NO3

Klik Lingkaran Klik Lingkaran

Anode Silver

(-)

(+)

CLICK ON

ON OFF

ACCU

MA NEGERI 3 MALANG

Cathode Iron

ANOD E OF SILV ER

MA NEGERI 3 MALANG

REACTION :  Silver ( Anoda ) : Ag(s)

Ag +(Aq) +

e ( oxidation )

Notes : Atom of Ag

ion of Ag+ Ion of NO3 Electron

Back

REACTION :  Iron (Cathoda ) :

Ag+(Aq) +

e

Ag(s) ( Reduction )

CATHODE OF IRON

MA NEGERI 3 MALANG

NOTES : Atom of Ag

ion of Ag+ ion of NO3 Electron

MENU

Back



Ele ctr op la tin g i s pr oce ss t o pl ate a me tal by o the r me tal wi th e lec trol ysis



Th e pu rpo se o f el ec tropl atin g is p rot ect ing me tal of c or rosio n o r m aki ng the p erfo rm anc e of m et al b et ter In el ect ropla tin g pro cess , the m et al t ha t w ill be p lat ed is pl ac ed as cat hode ( ne ga tive po le); t he p la ter m et al i s pl ac ed as ano de (po sitiv e po le )





The me tal s (ca tho de and a nod e) are imm er sed i nt o th e sol ut ion tha t ha s c atio n (p os itive io n) o f pl ater me tal

 Th e p lat er m et al is dis solv ed o r oxi diz ed i n solut ion fr om anod e , a nd it s io n i s pr eci pi tated or re duc ed in t he surfa ce o f ca thod e

MA NEGERI 3 MALANG

Example 1

1. Copper is plated by gold in the electrolyte solution of AuCl3

Reaction : 

Gold ( Anode ) : Au(s)



Copper ( Cathode ) : Au3+(Aq) + 3e

MA NEGERI 3 MALANG

Au3+(Aq) +

3e ( oxidation ) Au(s) ( Reduction )

Example 2

2. Iron is plated by silver in the elctrolyte solution of AgNO3 Reaction : 

Silver ( Anode ) : Ag(s)

 :

Iron ( Cathode ) Ag+(Aq) +

MA NEGERI 3 MALANG

Ag+(Aq) + e

e ( oxidation )

Ag(s) ( Reduction )

MENU

Choose the correct answer

1. The cause of dissolving of anode in electroplating is….

a. Anode is reduced b. Anode is oxidized c. Anode conduct electricity d. The present of electrolyte soluion e. The current of electron

Repeat

Menu

No 2

Menu

Nol 2

2.

In platting copper by gold, the wrong statement is….

a. Copper is as a cathode b. Gold is a anode c. Copper is reduced d. Gold is oxidized e. Use the gold solution

Repeat

Menu

No 3

Repeat

Menu

Nol 3

1.

In platting iron by silver, the chemical equation in cathode is ….

a. Ag+(aq) + e

Ag (s) ( reduction )

b. Ag+(aq) + e

Ag (s) ( oxidation )

c. Ag (aq) + e

Ag (s)

( reduction )

d. Ag (s)

Ag (aq) + e ( oxidation )

e. Ag (s)

Ag (aq) + e ( reduction )

Repeat

Menu

No 4

Repeat

Menu

Nol 4

4. Observe the following figure !

The correct chemical equation in copper is …. gol d

(-)

copper

a. Cu+(aq) + e

Cu (s) ( reduction )

B. Cu+(aq) + e

Cu (s) ( oxidation )

(+)

ACCU

Aucl3(aq)

c. Au(s) + 3e d. Au(s)

Au (s) ( reduction ) Au3+ (aq) + 3e ( oxidation )

e. Au 3+(aq) + 3e

Au (s) ( reduction )

Repeat

Menu

Repeat

Menu

Next

QUIT