Science Experiment "Phadung Krung Kasem Canal" Reconstruction

M.5/3 Science and English section

First Experiment: Water transparent

Work-day:       16 November 2003

Perform Implement

1.     Zakidisk brass plate                                         1 item

2.     Waist rope                                                         1 rope

Method Experiment

1.     Bring brass plate of water first spot (Yaknopawong) observe in white precinct of brass plate.

2.     Until we can’t to see it, already stretch out brass plate quantitively rope effect between plate to water surface spot and perform thus more 3 times.

3.     Experiment more 2 place such as limited.

Consequence Experiment

Experiment Conclude

To be arrange in transparent thus

·      Yaknoppawong                                        31.5 cm

·      Saipanya School                                       39.5 cm

·      Behind Unit of Water Keep litter           41.9 cm

From information Back of keep garbage is most transparent so there precinct are good receive supervise but Yaknoppawong has lowest transparent.

Second Experiment: Consider Acid-Base of water

Work-day:        23 November 2003

Perform Implement

1.     Universal indicator                                         1 box

2.     glass and cover                                               3 items

Method Experiment

1.     Bring glass 3 items to dip up water from 3 places such as limit together with write name of place on glass.

2.     Bring Universal indicator 1 sheet, already dip into glass number 1 and observe color of paper together with record.

3.     Thus water in more glass also makes the same as.

Consequence Experiment

Experiment Conclude

Standard on 5.0-9.0 so pH such as from each place have value straight to standard from environment committee.

Third Experiment: Consider of temperature

Work-day:       23 November 2003

Perform Implement

1.     Thermometer

2.     Pen

3.     Ruler or straightedge

Method Experiment

1.     Quantitative the weather temperature and record.

2.     Make defect on Thermometer by quantitative form extremity to rise up 10 cm.

3.     Dip Thermometer into water by defect make be sufficient with water surface wait until mercury constant already record.

Consequence Experiment

Experiment Conclude

Forth Experiment: Found Oxygen value in Phadung Krung Kasam Canal

Work-day:      12 December, 2003

Precinct:        Saipanya School

Purpose

1.      Able to fine Oxygen value from chemical experiment.

2.      To investigate canal thus to rule over.

Perform implement

1.       

2.       

3.       

4.       

5.       

6.       

7.       

8.       

9.       

10.    

11.   Calculator                                                                                                 1

Solution

1.      MnSO₄                         2.2 mol/dm³             2 cm³

2.      KI                                  1 mol/dm³                 2 cm³

3.      H₂SO₄                          concentrated             2 cm³

4.      Na₂S₂O₃                      0.005 mol/dm³         100 cm³

5.      Powder                         0.5 g                            1 cm³

6.      NaOH                           12.5 mol/dm³            2 cm³

To prepare solution

A chemical formula

• MnSO₄ quantity

                                                                           g = 0.7 gram        fill water 2 cm³

• KI quantity

                                                                           g = 0.3 gram        fill water 2 cm³

• Na₂S₂O₃ quantity

                                                                           g = 0.08 gram     fill water 100 cm³

• NaOH quantity

                                                                            g = 1 gram          fill water 2 cm³

Warning: Add acid to water must not add water to acid

Bring each solution into bigger 40 cm³ 3 items and quantity bottle 2 items.

Method Lab

1.      Keep (ex) water 250 cm³ in quantity bottle also close lid.

2.      Fill MnSO₄ 2.2 mol/dm³ 2 cm³ in (ex) water and close lid.

3.      Fill KI 1 mol/dm³ in NaOH 12.5 mol/dm³ already absorb solution into measure cylinder 2 cm³ also fill into (ex) water close lid and wait to precipitate.

4.      Bring H₂SO₄ intent 2 cm³ into (ex) water and reverse bottle.

5.      Bring solution from No 4. quantity 50 cm³ into bottle size 100 cm³, drop Na₂S₂O₃ 0.005 mol/dm³ until solution become yellow color.

6.      Fill powder water 1 cm³ for use indicator and tritrate also solution Na₂S₂O₃ until solution no color.

7.      Record all Na₂S₂O₃ quantity.

8.      Compute.

Consequence experiment thus

• When fill MnSO₄ in bottle of (ex) water has born yellow solution.

• When bring KI + NaOH already fill solution into bottle of (ex) water also reverse bottle until born precipitate.

• When fill H₂SO₄ find out that has higher temperature and lose brown precipitate.

• Bring (ex) water from mentioned 50 cm³ fill in bottle size 100 cm³ already drop Na₂S₂O₃ into bottle until yellow of water fade.

• When fill powder water for use indicator find out that solutions of (ex) water become blue color and blue precipitate. Already fill tritrate also Na₂S₂O₃ until solution no color.

• Na₂S₂O₃ quantity = 4.2 cm³ (Able made from Na₂S₂O₃ as remain pour off 90 cm³ remain 10 cm³ fill in measure cylinder find out that solution remain Na₂S₂O₃ 5.8 cm³ so all remain 95.8 cm³. Bring 100 cm³ – 95.8 cm³ = 4.2 cm³)

• When know all Na₂S₂O₃ quantity…

                                                               = 0.672 mg/dm³

Arising from water in canal shouldn’t have Oxygen lower 4 mg/dm³. But oxygen in water of canal in front Saipanya School is 0.672 mg/dm³. So water in canal in front Saipanya School has lower oxygen.

Reference: Chemistry Book No. 4 ว.033, 2524