7 min read
Preparing the Paper
Cut a paper strip about 2-3 cm wide. Draw a baseline about 1.5-2 cm from the end in PENCIL, not ink. Ink would dissolve and run with the sample. Put a tiny concentrated spot on the line with a capillary tube. A large blot streaks.
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Preparing the Paper
What is it?
Cut a paper strip about 2-3 cm wide. Draw a baseline about 1.5-2 cm from the end in PENCIL, not ink. Ink would dissolve and run with the sample. Put a tiny concentrated spot on the line with a capillary tube. A large blot streaks.
In simple words
- Cut a paper strip about 2-3 cm wide.
- Draw a baseline about 1.5-2 cm from the end in PENCIL, not ink.
- Pencil graphite does not dissolve in the solvent, so the start line stays put.
- Use a capillary to load a tiny concentrated spot.
Important terms
2-3 cm: Cut a paper strip about 2-3 cm wide.
1.5-2 cm: Cut a paper strip about 2-3 cm wide.
PENCIL: Cut a paper strip about 2-3 cm wide.
not ink: Cut a paper strip about 2-3 cm wide.
tiny concentrated spot: Cut a paper strip about 2-3 cm wide.
What you should learn
- State the main idea of preparing the paper in clear words.
- Explain why preparing the paper is useful in chemistry.
- Apply the correct method, observation, equation, or comparison.
- Avoid the common mistakes and write a complete exam answer.
Examples
- HB pencil line
- No ballpoint
- Line above the liquid
BASELINE IN PENCIL
Pencil graphite does not dissolve in the solvent, so the start line stays put. Ink is a mixture of dyes: it would chromatograph too and ruin the run. Keep the line 1.5-2 cm from the bottom so it sits above the solvent later.
THE SPOT
Use a capillary to load a tiny concentrated spot. Let it dry for a few minutes. If you need more sample, add another tiny drop on the same point after the first is dry. A large wet blot spreads sideways and streaks.
Recommended for Class 9
Full school-level explanation
Cut a paper strip about 2-3 cm wide. Draw a baseline about 1.5-2 cm from the end in PENCIL, not ink. Ink would dissolve and run with the sample. Put a tiny concentrated spot on the line with a capillary tube. A large blot streaks.
Pencil and spot size both matter:
WHAT — Core idea
Cut a paper strip about 2-3 cm wide. Draw a baseline about 1.5-2 cm from the end in PENCIL, not ink. Ink would dissolve and run with the sample. Put a tiny concentrated spot on the line with a capillary tube. A large blot streaks.
WHY — Why it matters
Width about 2-3 cm is enough to hang straight without wasting paper. Label the top in pencil as well, so you know which strip is which after drying.
HOW — Method, evidence, or comparison
1. 1. BASELINE IN PENCIL: Pencil graphite does not dissolve in the solvent, so the start line stays put. Ink is a mixture of dyes: it would chromatograph too and ruin the run. Keep the line 1.5-2 cm from the bottom so it sits above the solvent later. 2. 2. THE SPOT: Use a capillary to load a tiny concentrated spot. Let it dry for a few minutes. If you need more sample, add another tiny drop on the same point after the first is dry. A large wet blot spreads sideways and streaks.
HOW — Answer in an exam
PENCIL, not ink. Tiny dry spots, not a puddle. The baseline must stay above the solvent when the strip is standing in the cylinder.
BASELINE IN PENCIL
Pencil graphite does not dissolve in the solvent, so the start line stays put. Ink is a mixture of dyes: it would chromatograph too and ruin the run. Keep the line 1.5-2 cm from the bottom so it sits above the solvent later.
Remember
- Pencil
- does not dissolve
- Ink
- 1.5-2 cm
Examples
- HB pencil line
- No ballpoint
- Line above the liquid
THE SPOT
Use a capillary to load a tiny concentrated spot. Let it dry for a few minutes. If you need more sample, add another tiny drop on the same point after the first is dry. A large wet blot spreads sideways and streaks.
Remember
- capillary
- tiny concentrated
- few minutes
- streaks
Examples
- One pin-head spot
- Dry, then a second touch
- A big blot: streaks
Remember
- 2-3 cm
- 1.5-2 cm
- PENCIL
- not ink
- tiny concentrated spot
- capillary
- large blot streaks
- 2-3 cm
How the ideas connect
Width about 2-3 cm is enough to hang straight without wasting paper. Label the top in pencil as well, so you know which strip is which after drying.
Deeper understanding
Go beyond memorising Preparing the Paper. Connect the definition to reasons, relationships, exceptions, and exam wording.
How the ideas connect
Width about 2-3 cm is enough to hang straight without wasting paper. Label the top in pencil as well, so you know which strip is which after drying.
Common mistakes
Exam focus
WHAT
Key Points
HOW
Example
Exam focus
Quick revision
- 2-3 cm
- 1.5-2 cm
- PENCIL
- not ink
- 2-3 cm: Cut a paper strip about 2-3 cm wide.
- 1.5-2 cm: Cut a paper strip about 2-3 cm wide.
PENCIL, not ink. Tiny dry spots, not a puddle. The baseline must stay above the solvent when the strip is standing in the cylinder.
For long answers on Preparing the Paper: define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- 2-3 cm
- 1.5-2 cm
- PENCIL
- not ink
Important formulas
- 2-3 cm
- 1.5-2 cm
- PENCIL
Common exam traps
- Draw the baseline with pencil, not ink, because ink may separate and spoil the result.
- A large wet spot streaks; use a small concentrated spot and let it dry.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
Draw the baseline with pencil, not ink, because ink may separate and spoil the result.
- Mistake
A large wet spot streaks; use a small concentrated spot and let it dry.
- Mistake
PENCIL, not ink. Tiny dry spots, not a puddle. The baseline must stay above the solvent when the strip is standing in the cylinder.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
2-3 cm
1.5-2 cm
PENCIL
not ink
Cut a paper strip about 2-3 cm wide. Draw a baseline about 1.5-2 cm from the end in PENCIL, not ink. Ink would dissolve and run with the sample. Put a tiny conc
- Definition
- Cut a paper strip about 2-3 cm wide. Draw a baseline about 1.5-2 cm from the end in PENCIL, not ink. Ink would dissolve and run with the sample. Put a tiny conc
- Example
- HB pencil line
- Critical warning
- Draw the baseline with pencil, not ink, because ink may separate and spoil the result.
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Exam Practice
Define
Q1. Define Preparing the Paper.
Explain
Q2. Explain: BASELINE IN PENCIL.
Example
Q3. Give one clear example of Preparing the Paper and say why it fits.
Mistake
Q4. State one common mistake students make about Preparing the Paper.
Exam note
Q5. Write a short exam note on Preparing the Paper: definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.