Page 5 - Modul A+1 Kimia Tingkatan 5

Eksperimen 1.1

Tujuan/ Aim:
Eksperimen Wajib To determine the voltage of a voltaic cell by using different pairs of metals. Bab 1
Menentukan nilai voltan dalam sel kimia dengan menggunakan pasangan logam yang berlainan.
Eksperimen
Pernyataan masalah/ Problem statement:
Bagaimanakah pasangan logam berlainan yang dicelup di dalam elektrolit mempengaruhi nilai voltan sel kimia?
How can different pairs of metals dipped into electrolytes affect the voltage of the voltaic cell?

Hipotesis/ Hypothesis: TP 3
Pasangan logam dengan perbezaan nilai keupayaan elektrod piawai yang lebih besar akan menghasilkan nilai
voltan yang lebih besar.
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The pairs of metals with greater difference of standard electrode potential value will produce greater voltage readings.
Pemboleh ubah/ Variables: TP 3
(a) dimanipulasikan/ manipulated: Pasangan logam berlainan/ Different pairs of metals.
(b) bergerak balas/ responding: Nilai voltan sel/ The voltage reading of the cell.
(c) dimalarkan/ fixed: Isi padu dan kepekatan elektrolit/ Volume and concentration of electrolytes.

Bahan/ Materials:
Kepingan kuprum, Cu, paku besi, Fe, kepingan zink, Zn, pita magnesium, Mg, kertas pasir, larutan ferum(II) sulfat,
–3
–3
–3
Fe SO 1.0 mol dm , larutan kuprum(II) sulfat, CuSO 1.0 mol dm , larutan zink sulfat, ZnSO 1.0 mol dm ,
4
4
4
2
larutan magnesium sulfat, MgSO 1.0 mol dm –3
4
-3
Copper, Cu plate, iron, Fe nail, zinc, Zn plate, magnesium, Mg ribbon, sandpaper, 1.0 mol dm iron(II) sulphate, Fe SO solution,
2 4
-3
1.0 mol dm copper(II) sulphate, CuSO solution, 1.0 mol dm zinc sulphate, ZnSO solution, 1.0 mol dm magnesium sulphate,
-3
-3
4 4
MgSO solution
4
Radas/ Apparatus:
3
Voltmeter, bikar 250 cm , wayar penyambung dengan klip buaya, pasu berliang
Voltmeter, 250 cm beaker, connecting wires with crocodile clips, porous pot
3
Prosedur/ Procedure:
Voltmeter
Voltmeter
V
Kepingan Kepingan zink, Zn
kuprum, Cu Zinc electrode
Copper electrode
Pasu berliang yang berisi
Larutan kuprum(II) larutan zink sulfat, ZnSO
4
sulfat, CuSO4
Copper(II) sulphate,
CuSO4 solution
Rajah/Diagram 1.11
1. Semua kepingan logam dibersihkan dengan kertas pasir.
All metal plates are cleaned with sandpaper.
2. Pasu berliang diisi dengan larutan zink sulfat, ZnSO 1.0 mol dm sehingga dua per tiga penuh.
–3
4
A porous pot is filled with 1.0 mol dm zinc sulphate, ZnSO solution until it is two-third full.
–3
4
3. Kepingan zink, Zn direndam di dalam larutan zink sulfat, ZnSO 1.0 mol dm .
–3
4
A zinc, Zn plate is dipped into zinc sulphate, ZnSO solution.
4
4. Bikar diisi dengan larutan kuprum(II) sulfat, CuSO 1.0 mol dm sehingga separuh penuh.
–3
4
A beaker is filled with 1.0 mol dm copper(II) sulphate, CuSO solution until it is half full.
–3
4
5. Kepingan kuprum, Cu direndam di dalam larutan kuprum(II) sulfat, CuSO 1.0 mol dm .
–3
4
The copper, Cu plate is dipped into 1.0 mol dm copper(II) sulphate, CuSO solution.
–3
4
6. Pasu berliang diletakkan di dalam bikar.
The porous pot is placed into the beaker.
7. Litar dilengkapkan dengan menyambungkan kedua-dua kepingan logam kepada voltmeter seperti ditunjukkan
Rajah 1.11.
The circuit is completed by connecting both metal plates to a voltmeter as shown in Diagram 1.11.
8. Bacaan voltmeter direkodkan.
The reading of the voltmeter is recorded.
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