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Paper 6Alternative to PracticalPractical1 marks
A student is performing a titration to determine the concentration of hydrochloric acid using sodium hydroxide as the titrant.
Method
Titration Method
The student adds sodium hydroxide to hydrochloric acid until the indicator changes color.
| Step | Action |
|---|---|
| 1 | Fill a burette with sodium hydroxide. |
| 2 | Add a few drops of phenolphthalein to the acid. |
| 3 | Slowly add sodium hydroxide to the acid while swirling. |
| 4 | Stop when the solution turns pink. |
- a[1]
Identify the independent variable in this titration method.
Aim for approximately 1 distinct marking point.
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