The identification is usually right. The recording of how it was reached is usually not.
Updated 17 September 2026 · Delhi Home Tutor
In salt analysis the marks are for the systematic procedure and the observations recorded along the way, not only for naming the salt correctly. Students who identify it by recognition, or who work out the answer and then write a tidy set of observations backwards, lose marks they could have kept simply by writing down what they actually did.
| Class | 11 and 12 |
|---|---|
| Subject | Chemistry |
| Marks for | Systematic procedure and honest observations |
| Not only for | The correct identification |
| Common loss | Working backwards from a guessed answer |
| Enquiries | +91 92121 42427 |
The procedure is the answer
Salt analysis is examined as a method: preliminary tests, then the systematic group separation for the cation, then the confirmatory tests, with observations and inferences recorded at each stage. A student who writes only "the salt is X" has skipped almost everything that carries credit.
Marks are also given for the inference drawn from each observation — the reasoning step between what was seen and what it means. Students routinely record observations and omit the inference, which is half the credit on each line.
Writing the observations backwards from a guessed answer is visible and it is penalised. Real analysis produces some ambiguous or negative results; a record where every test came out cleanly positive in the right order reads as constructed, and it also leaves the student unable to answer the obvious viva question about anything that did not work.
The record format that scores
- Experiment, observation, inference in three columns, on every line.
- Negative results recorded too, because they narrow the possibilities and are part of the reasoning.
- Equations written for the confirmatory tests, balanced, with conditions where relevant.
- A concluding statement naming both ions, not just the salt.
The common practical errors
Contaminated apparatus producing a false positive, insufficient washing between tests, and adding reagents in the wrong order so a later test is compromised. Each is a technique issue rather than a chemistry one, and each is best fixed by doing the analysis several times rather than by reading about it.
The other frequent problem is rushing the preliminary tests, which are what narrow the field and save time later.
How to prepare for it
Perform the analyses, more than once, and write the record each time in the exam format. Reading a salt analysis chart produces recognition and no ability to work systematically under observation, which is precisely what the exam assesses.
Questions parents ask
My child identifies the salt correctly and scores moderately.
Then the marks are going on the record. The identification is the smaller part of the credit.
Should negative results be written?
Yes. They are part of the reasoning and they earn marks.
How much practice is needed?
Several complete analyses, recorded in full. It is a procedural skill and it needs repetition.
Can a home tutor help with this?
With the systematic method, the record format, the equations and the viva, substantially. The bench technique belongs in the school lab.
Need Help With Chemistry Practicals?
One-to-one chemistry tuition at home or online, covering the method, the record and the viva.
Call / WhatsApp +91 92121 42427