PREPARATORY PROBLEM 30 (PRACTICAL) Reagents and Equipment - Acid–base indicator: 1 - Bromothymol Blu — Analytical Chemistry Chemistry Question
Identification of Unknown Solutions (II) – Spot Test with Electrolysis
PREPARATORY PROBLEM 30 (PRACTICAL)
Reagents and Equipment
- Acid–base indicator: 1
- Bromothymol Blue: 1
- Distilled water: 1
- Simple electrolysis apparatus as shown in Fig 1. [VISUAL]
- Coffee stirrer: 2
- Tissue paper
- Unknown samples: 10 unknown samples are shown in the Data Sheet.
Identification of Unknown Solutions
Identify 10 unknown samples (code number: X01 ~ X10)
Note:
(1) The compounds in the unknown solutions are given in the Data Sheet.
(2) Each unknown sample contains only one compound.
(3) The concentration of each unknown solution is about 0.1 mol dm –3.
(4) Write your answers (code number) in the blanks of your Data Sheet.
Identify 10 unknown samples (code number: X01 ~ X10) and write your answers (code number) in the blanks of your Data Sheet.
Data Sheet 30
| Compound | Number | Compound | Number | Compound | Number |
| --- | --- | --- | --- | --- | --- |
| Cd(NO3)2 | ____ | Na2S | ____ | H2SO4 | ____ |
| KI | ____ | Pb(NO3)2 | ____ | NaOH | ____ |
| Na2S2O3 | ____ | HCl | ____ | Zn(NO3)2 | ____ |
| NaCl | ____ | | | | |
[VISUAL]