ChemistryChapter 19: Chromatography
Locating
If the mixture is colourless, you cannot see the spot until you develop it.
Learning objectives
- Define and explain locating.
- Apply locating to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
If the mixture is colourless, you cannot see the spot until you develop it. Draw the solvent front in pencil before it dries away. Measure from the original pencil start line, not from the bottom of the paper.
Important terms
- Locating
- If the mixture is colourless, you cannot see the spot until you develop it. Draw the solvent front in pencil before it dries away. Measure from the original pencil start line, not from the bottom of the paper.
Overview
Learn the idea, then use it:
Core Understanding
If the mixture is colourless, you cannot see the spot until you develop it. Draw the solvent front in pencil before it dries away. Measure from the original pencil start line, not from the bottom of the paper.
Examples pencil start line · front before it fades · locating agent · LOCATING: If the mixture is colourless, you cannot see the spot until you develop it. Draw the solvent front in pencil before it d
Exam Application
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Examples Define first · Show the rule or evidence · Check units, labels, and conclusion
WHAT — LOCATING
If the mixture is colourless, you cannot see the spot until you develop it. Draw the solvent front in pencil before it dries away. Measure from the original pencil start line, not from the bottom of the paper.
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
In simple words
Do not merge locating with a neighbouring idea that uses a different definition, rule, or method.
Key points
- pencil start line
- front before it fades
- locating agent
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Locating
Sticky Notes · Quick Revision
Core Idea
- If the mixture is colourless, you cannot see the spot until you develop it.
Key Points
- pencil start line
- front before it fades
- locating agent
Simple Check
- Explain locating in your own words and connect it to one chapter example.
How to Answer
- Define the idea, show the main rule or evidence, apply it, and check the final statement.
Common Mistake
- Do not merge locating with a neighbouring idea that uses a different definition, rule, or method.
FBISE Exam Tip
- Use the exact term, show working where needed, and include units or labelled evidence.
60-second revision
- If the mixture is colourless, you cannot see the spot until you develop it.
- pencil start line
- front before it fades
- locating agent
Did you understand this topic?
Your answer is saved with your learning record. It does not mark the topic as mastered.