8/12/2019 Worksheet 7.3 the Strength of Ethanoic Acid and Nitric Acid of the Same Concentration

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Name : Paper 3 (Written Practical Test)

1. pHis a measure of the concentration of hydrogen ions in a solution. The lower the pHvalue, the higher the concentration of hydrogen ions in the solution.

Using the above information, plan a laboratory experiment to compare the strength ofethanoic acid and nitric acid of the same concentration, based on their pH values.

pH ialah suatu ukuran kepekatan ion hidrogen dalam suatu larutan. Semakin rendahnilai pH, semakin tinggi kepekatan ion hidrogen dalam larutan itu.

Gunakan maklumat di atas, rangcang satu eksperimen untuk membandingkan kekuatanasid etanoik dan asid nitrik yang mempunyai kepekatan yang sama, berdasarkan nilai pHasid masing masing.

(a) Aim of experiment Tujuan eksperimen [ 2 ]

(b) All the variables Semua pembolehubah [ 3 ]

(c) Statement of the hypothesis Pernyataan hipotesis [ 3 ]

(d) List of material and apparatus Senarai bahan dan radas [ 3 ]

(e) Procedure Prosedur [ 3 ]

(f) Tabulation of data Penjadualan data [ 3 ]

Write your answers in the spaces provided.

(a) Aim of experiment/Tujuan eksperimen

(b)

(All the variables)

Manipulated Variable/Pembolehubah dimanipulasi:

Responding Variable/Pembolehubah bergerak balas :

Control Variable / Pembolehubahdimalarkan :

(c) Statement of the hypothesis /Pernyataan hipotesis :

(d) Material / Bahan:

Apparatus / Rada :

(e) Procedure / Prosedur :

(f) Tabulation of data /Penjadualan data:

Worksheet No. 7.3 Form 4 Topic 7 Acid and Base

8/12/2019 Worksheet 7.3 the Strength of Ethanoic Acid and Nitric Acid of the Same Concentration

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Suggested answer for

(a) Aim:

Tujuan:

To determine the strength of acids of the same concentration based on their pHvalues

Menentukan kekuatan asid degan kepekatan yang sama, berdasarkan nilai pHasid masing-masing.

(b)

(All the variables)Manipulated Variable :Pembolehubahdimanipulasi :

Ethanoic acid and nitric acid// type of acids

Asid etanoik dan asid nitrik // jenis asid

Responding Variable:Pembolehubah bergerakbalas :

pH value

nilai pHControl Variable :Pembolehubahdimalarkan :

Concentration of the acid//volume of acid

Kepekatan asid// isipadu asid

(c) Statement of thehypothesis :Pernyataan hipotesis :

The acid that gives a lower pH is the strong acid whereas the acid with thehigher pH is the weak acid.Bagi Asid degan kepekatan yang samayang digunakan, semakin rendah nilaipH nya

(d) Material :Bahan :

Apparatus :

Radas :

0.1mol dm-3

ethanoic acid, 0.1mol dm-3

nitric acid, and distilled water

Measuring cylinder, 2 boiling tubes or 100cm3beakers, test tube rack, ( required

if beakers are used), pH meter.Silinder penyukat, 2 tabung didih atau 100cm

3bikar, rak tabung uji (tak perlu

jika bikars diguna), meter pH

(e) Procedure :

Prosedur:

1. 20 cm3of 0.1 mol dm

-3ethanoic acid is measured by using a

measuring cylinder.

2. The ethanoic acid is then poured carefully into a boiling tube.3. By dipping a pH meter into etahnoic acid in the boiling tube, the pHof the acid is measured

4. Read the pH reading accurately and record the reading in a table.5. Repeat steps 1 to 4 by using 0.1 moldm

-3nitric acid.

1. Sukat 20 cm30.1 mol dm

-3asid etanoik dengan silinder penyukat.

2. Tuang asid nitrik itu ke dalam sebuah tabung didih dan letakannya

pada satu rak tabung uji.

3. Satu pH meter dicelup ke dalam asid itu untuk menyukat nilai pH nya.

4. Bacakan nilai pH dengan tepat dan rekodkan nilai itu dalam satu jadual.

5. Langkah 1 4 diulangi dengan menggunakan 0.1 mol dm-3

asid nitrik.

(f) Tabulation of data :

Penjadualan data: ExptEksp

Type of Acid/

Jenis asid

pH value/nilai pH

1 0.1 mol dm-3

asid etanoik

2 0.1 mol dm-3

asid nitrik

Worksheet No. 7.3

8/12/2019 Worksheet 7.3 the Strength of Ethanoic Acid and Nitric Acid of the Same Concentration

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