Page 66 - Hybrid PBD 2022 Tg 5 - Kimia

Kimia Tingkatan 5 Bab 4

7. Jalankan eksperimen berikut. SP 4.2.2 TP3 TP4 KBAT Mengaplikasi & Menganalisis
Carry out the following experiment.

Eksperimen
Eksperimen
Tujuan / Aim:
Untuk menentukan punca lateks menggumpal dan cara mencegah lateks daripada menggumpal.
To determine the cause of latex to coagulate and the way to prevent latex from coagulating.
Pernyataan masalah / Problem statement:
Adakah asid menyebabkan lateks menggumpal dan alkali mencegah lateks daripada menggumpal?
Does acid cause latex to coagulate and alkali to prevent latex from coagulating?

Hypotesis / Hipotesis: Lateks + asid etanoik
1. Penambahan asid ke dalam lateks menggumpalkan lateks. Latex + ethanoic acid
The addition of acid to latex causes latex to coagulate.
2. Penambahan alkali ke dalam lateks mencegah penggumpalan lateks.
The addition of alkali to latex prevents the coagulation of latex.
Pemboleh ubah / Variables:
A
(a) Dimanipulasikan : Asid etanoik, CH 3 COOH, larutan ammonia, NH 3
Manipulated Ethanoic acid, CH 3 COOH, ammonia, NH 3 solution Lateks + larutan ammonia
Latex + ammonia solution
(b) Bergerak balas : Penggumpalan lateks
Responding Coagulation of latex
(c) Dimalarkan : Isi padu lateks
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Volume of latex
Bahan / Materials:
Lateks, asid etanoik 2.0 mol dm , dan larutan ammonia 2.0 mol dm . B
–3
–3
Latex, 2.0 mol dm of ethanoic acid and 2.0 mol dm of ammonia, NH 3 solution. Lateks sahaja
–3
–3
Latex only
Radas / Apparatus:
Bikar, silinder penyukat, rod kaca, dan penitis.
Beaker, measuring cylinder, glass rod and dropper.
Kaedah / Procedure:

1. Label tiga bikar dengan huruf A, B dan C. C
Label three beakers with letters A, B and C.
2. Sukat dan tuang 20 cm lateks ke dalam bikar A, B dan C masing-masing.
3
Measure 20 cm of latex and pour it into beakers A, B and C respectively.
3
3. Sukat dan tuang 2 cm asid etanoik ke dalam bikar A. Kacau campuran secara berterusan dengan
3
rod kaca.
Measure 2 cm of ethanoic acid and pour it into beaker A. Stir the mixture continuously with a glass rod.
3
4. Sukat dan tuang 2 cm larutan ammonia ke dalam bikar B. Kacau campuran secara berterusan
3
dengan rod kaca.
Measure 2 cm of ammonia solution and pour it into beaker B. Stir the mixture continuously with a glass rod.
3
5. Biarkan bikar-bikar tersebut dan rekodkan pemerhatian selepas 30 minit.
Leave the beakers aside for 30 minutes and record the observation.

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04 Hybrid Kimia Tg5.indd 137 05/11/2021 4:20 PM