Page 43 - APS(2022)_TG5 _Edisi Guru

Sains Tingkatan 5 Bab 3
Tarikh:

AKTIVITI Mengkaji Tahap Pencemaran Air daripada Sisa Domestik
Inkuiri 3.10 To Study the Water Pollution Level from Domestic Waste
Penemuan Inkuiri

Tujuan Mengkaji tahap pencemaran air daripada pelbagai sumber air.
Aim To study the level of water pollution in different sources of water.

Bahan Larutan metilena biru 0.1%, sampel air daripada sumber yang berbeza (air suling, air longkang,
Materials air kolam, air sungai)
0.1% methylene blue solution, water samples from different sources (distilled water, drain water, pond water, river water)

Radas Botol reagen dengan penyumpat, picagari, jam
Apparatus Reagent bottles with stopper, syringe, clock 3

Prosedur Picagari BAB
Procedure
Botol reagen Syringe
3
Reagent bottle Larutan metilena biru (1 cm )
Methylena blue solution (1 cm )
3
Penutup botol
Bottle cover Sampel air (100 cm )
3
Water sample (100 cm )
3
1. Label empat botol reagen sebagai P, Q, R dan S. Isi setiap botol reagen dengan 100 cm
3
sampel air yang dikumpulkan masing-masing.
3
Label four reagent bottles as P, Q, R and S. Fill each reagent bottle with 100 cm of the collected water samples
respectively.
P – Air suling
Distilled water
Q – Air longkang
Drain water
R – Air sungai
River water
S – Air kolam
Pond water

2. Kemudian, tambahkan 1 cm larutan metilena biru ke dalam setiap botol reagen menggunakan
3
picagari.
3
Then, add 1 cm of methylene blue solution into each reagent bottle using a syringe.
3. Tutup botol reagen dengan segera. (Jangan goncang botol reagen)
Close the reagent bottle immediately. (Do not shake the bottle)
4. Letakkan semua botol di dalam almari gelap.
Place all the bottles in a dark cupboard.
5. Periksa perubahan warna untuk setiap botol pada selang masa 1 jam.
Every 1 hour, check for the change in the colour for every bottle.
6. Rekodkan masa yang diambil untuk warna larutan metilena biru menjadi luntur.
Record the time taken for the methylene blue solution to turn colourless.

Keputusan Masa yang diambil untuk melunturkan warna larutan
Results Botol reagen Sampel air
Reagent bottle Water sample metilena biru (jam)
Time taken for methylene blue solution to turn colourless (hours)
Air suling Tidak diluntur
P
Distilled water Did not turn colourless
Air longkang
Q 0.5
Drain water
Air sungai
R 1
River water
Air kolam
S 2
Pond water

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03 BAB 3.indd 67 7/28/21 2:35 PM