NIOS Class 12 Chemistry 313 Solved Practical File (Lab Manual)
The Smartest Guide to Your Chemistry Practical Journey Starts Here
You're running out of time before the submission deadline, and you are still not sure how to complete your NIOS Chemistry 313 solved Practical File (Lab Manual) correctly. It's not just you. Students lose marks not because of complex chemistry but due to a sloppy format, missing steps and outdated formats. This page corrects that. Unnati Education provides a clean NIOS Class 12 Chemistry 313 solved Practical File (Lab Manual) that is aligned with the October 2025 tests.
Chemistry Practical File Covered
| S. No. | Experiments |
|---|---|
| 1 | Experiment 1: Basic Laboratory Techniques - Volumetric Analysis Introduction |
| 2 | Experiment 2: Determination of Strength of a Given Solution of Sodium Hydroxide by Titration with Standard Solution of Oxalic Acid |
| 3 | Experiment 3: Determination of Strength of a Given Solution of Dilute Sulphuric Acid by Sodium Carbonate Solution |
| 4 | Experiment 4: Determination of the Strength of a Given Solution of Sodium Hydroxide by Standard Solution of Hydrochloric Acid |
| 5 | Experiment 5: Determination of the Heat of Dissolution of Ammonium Chloride |
| 6 | Experiment 6: Determination of the Heat of Neutralisation of a Strong Acid (HCl) by a Strong Base (NaOH) |
| 7 | Experiment 7: To find the pH of Different Solutions Using pH Paper and Universal Indicator |
| 8 | Experiment 8: Study the pH Change by Using Universal Indicator or pH Meter During the Reaction Between HCl and NaOH Solution |
| 9 | Experiment 9: Study the Rate of Reaction Between Iodine and Sodium Thiosulphate |
| 10 | Experiment 10: To Study the Effect of Concentration on the Rate of Reaction Between Sodium Thiosulphate and HCl |
| 11 | Experiment 11: To Study the Effect of Temperature on the Rate of Reaction Between Sodium Thiosulphate and HCl |
| 12 | Experiment 12: To Study the Effect of Catalyst on the Rate of Reaction Between Sodium Thiosulphate and HCl |
| 13 | Experiment 13: Qualitative Analysis of Simple Salts |
| 14 | Experiment 14: Qualitative Analysis of Organic Compounds |
| 15 | Experiment 15: To Prepare Crystals of Copper Sulphate |
| 16 | Experiment 16: To Prepare Crystals of Alum (Potassium Aluminium Sulphate) |
| 17 | Experiment 17: To Study the pH Change During the Reaction Between Oxalic Acid and KMnO4 |
Download Solved Practical File
The importance of completing the NIOS Class 12 Chemistry 313 solved Practical File (Lab Manual) correctly.
Practicals are just as important as theory. The file may be incomplete, calculations might not match observations, or the viva could reveal that students have memorised the steps without understanding their purpose. Students can lose up to 20 marks if the file is not complete, the calculations do NOT match the observations, and the viva shows they did not understand the purpose. A NIOS Class 12 Chemistry practical file will keep you safe from all three sides:
- Every experiment should be formatted according to the NIOS format
- Steps, observations and calculations are presented in a transparent manner
- Simple theory blocks to show that you understand the reactions
- Viva notes, which are concise, factual and exam-friendly
You're not submitting random pages, but evidence. Your internal score will increase when your NIOS Class 12 Chemistry Practical File is professional and consistent.
The latest October 2025 NIOS chemistry 313 manual contains the following:
Our NIOS class 12 Chemistry 313 solved Practical File (Lab Manual) does not contain a bunch of answers. This is a file that follows the exact format most study centres prefer.
- Cover page with subject code, session and your details
- The certificate page index will match your pagination
- The following is the exact order in which you should write your experiments:
- Aim
- Apparatus, chemicals and other apparatus
- The theory of 4 to 6 tight Lines
- The procedure is numbered in steps
- Tables of observations
- Calculations in clear units
- Results in one sharp line
- Labelled and dated neat diagrams, where necessary
- Short viva banks at the end of each experiment
- Checklist to ensure you don't miss anything: signatures, page numbers or index sync
The wording is all updated to October 2025 so that you are not caught with old formats or faulty phrasing.
What each category of experiment teaches, and how to score it
The following are the prominent experiment families found in NIOS centres. Use this section to learn why they are important and how you can present them so that your marks do not leak away.
Standardisation and determination of strength for acid-base titrations
What is it proving
You will learn how to find concentrations unknown using a standard and an endpoint indicator. This test tests your technique and ability to read burette values.
What examiners look for
Why you should never top up between readings
Change of colour and indicator choice at the endpoint
Readings that are within a narrow range
Use of correct normality and molarity in calculations
How To Present
Table of observations with the initial and final readings on the burette in at least three tests
Only concordant values
Calculation steps that end with a result on a single line with the unit
Viva Pointer
Explain the reason why phenolphthalein was chosen for a strong base-strong acid, and what will happen if you go over your endpoint.
2) Redox titrations: dichromate or permanganate-based
What you prove is that you can handle self-indicating systems and work without external dye. This test requires careful reading and control of time.
What do examiners look for
Glassware should be cleaned without reducing agents
Use sulfuric acid only when necessary
Consistent endpoint judgment
How To Present
The oxidation state theory in short
Tidy table of observation and mean value
Equivalent weight logic and balanced redox equation
Viva Pointer: Why does the oxalic titration of KMnO4 require heating and an acidic medium?
Salt analysis: Simple cation tests and anion tests
What the test proves: Using group reagents, you can identify unknowns.
What examiners look for
The order of the group test, not random guesses
Clean separation of cations when needed
Confirmatory tests recorded with colour and precipitate Nature
How To Present
Table arranged in a flow-like manner: group tests, preliminary tests and confirmatory tests
Not vague lines, but "white ppt is soluble in excess of NH4OH".
The final salt inference is in one line
Viva Pointer
Differences between group reagents and confirmatory reagents, and why sequencing is essential.
4) Qualitative tests of organic substances: identification of functional groups
What does it prove
Connect observations to functional groups such as amine, carboxylic acids, ketone and carboxylic acids.
What examiners look for
Test choice: 2,4-DNP, FeCl3, Tollen's for aldehyde, Tollen's for phenol
Safety when using reagents such as Br2, water or conc. H2SO4
Accuracy in colour or precipitation description
How To Present
Compact theory: the specific equation for the reaction, if needed
Your observation and inference, test name, step, and the expected change
Viva Pointer: How Tollen works with aldehydes, but not ketones.
5) Simple Kinetics or Rate Studies
What you learn: Understand how time or concentration affects speed and how to plot simple graphs.
What examiners look for
Consistent sampling and accurate timekeeping
Labelling axes, choosing the scale, and creating a straight or curvy trend
Basic conclusion based on observed slope or half-life style reading
How To Present
Table of observations with time and reading
A single graph with axes and unit labels
Trend-related one-line conclusions
Viva Pointer
Temperature Effect on Rate and Simple Collision Theory Line.
6) Demonstrations of chromatography, adsorption or colloids
What is it proving
It can be used to show surface phenomena or different components using differential adsorption.
What examiners look for
The correct stationary and mobile phases are mentioned
Calculate Rf where applicable
Diagram of a clean setup
How To Present
Two-line theory is a short version of the two-line theory
Steps, neatly drawn diagram, observation and Rf, or adsorption notes
Viva Pointer Reason Rf is dimensionless but remains characteristic in fixed conditions
7) Preparation or crystallisation experiments
What It Proves
It is possible to carry out a reaction with purity logic and isolate the product.
What examiners look for
The idea of safety, yield, and purity checks
Washing and drying properly
How To Present
Limiting reagent in a balanced equation
Calculate the yield if you are asked
Comment on the result about appearance and purity
Viva pointer
Why does the cooling rate affect crystal size?
The structure of your file protects the marks.
Markers like predictable structure. Your NIOS class 12 Chemistry 313 solved Practical File (Lab Manual) follows the same professional format from page one.
- Aim
- Apparatus and chemicals, with concentrations as relevant
- Theory in brief lines to prove that you understand
- Steps of the procedure with safety notes
- Observations with Units
- Calculations - Ensure that they are written clearly and correctly
- result with unit and clarity in one line
- Mini list for last-minute revision
Never randomly paste photos. Always keep your handwriting legible. If you have printed pages available, be sure to staple them carefully and maintain a precise index-page map.
Drainage marks: Common mistakes and how to prevent them
Final result without units. Each calculation in our file is concluded with a unit.
- Dirty or reused indicator-contaminated glassware
- We note rinsing steps, so your readings stay tight.
- Wrong mean value
- Only concordant values are averaged, and rounding should be sensible.
- Copying theory blocks unthinkingly, we have short, specific theory lines and not general fluff.
- Vague colour descriptions
- "Pale pink persists for 30 seconds", not "pinkish" is written.
They may seem small, but these are the most common mistakes that students make and lose between 8 and 12 marks.
What you learn beyond submission: Skills that are useful in real-life labs and viva tests
- Measurement discipline based on titrations
- Analysis using salt analysis schemes
- Safety Habits around glassware, oxidisers and acids
- Data Honesty Through tables and graphs that match your final results
It is not the point of a good Class 12 NIOS Chemistry practical file to impress people with long paragraphs. You should be able to run an experiment correctly, document it honestly and explain why within two lines.
Unnati Education is the best choice for Chemistry 313
- Updated for October 2025 Checks
- English and Hindi versions
- Handwritten or printed options look professional
- WhatsApp supports quick and accurate corrections, as well as fast answers to questions.
- Add-ons include: previous year papers, solved TMAs and quick viva drills
We do not dump pages at you. You can send the file with confidence.
How to order the NIOS Chemistry 313 Practical File (Lab Manual).
WhatsApp: 8800 777430
Mention the session: Oct 2025
Choose format: Handwritten, PDF, or Printed copy
If you need courier delivery, please share your address.
You can expect to receive the file within 24 to 48 hours, depending on the format and location.
You need to make minor edits in your centre? Let us know upfront. We will align your file to ensure that you do not argue when submitting the document.
Support that goes beyond the file
- TMAs solved for Chemistry and other subjects
- Admission Help for Streams 1-4
- Recorded classes and live classes on targeted topics
- IGNOU Help: If you are planning to continue your studies
- Quick Exam Tips and YouTube Explainers for Sticky Concepts
Stop making the same mistakes. Focus on the theory after you have completed the file.
FAQs: NIOS Chemistry 313 practical file solved (Lab Manual).
Q1. The NIOS Class 12 Chemistry 313 practical file follows the current NIOS format, including the experiment list. The same structure has been submitted by students in India and abroad without being rejected.
Q2. Do you have both Hindi and English versions available?
We'll send you the same experiment in your preferred language.
Q3. What happens if I still don't get a certain step after purchasing?
Send a message on WhatsApp. We will explain the concept step-by-step. Short voice notes if needed. You will not be stuck.
Q4. Can I order only a file that is handwritten?
Included are neat handwriting, tables with labels, and diagrams. This is preferred by many centres. You can also get it printed out or in PDF format if you prefer to do so later.
Final Word
It is essential to finish the NIOS Chemistry 313 solved Practical File (Lab Manual) as soon as possible. This will ensure that you get the internal marks you need and prevent last-minute panic. You should use a file which follows the correct sequence, has clean observations and closes with the proper units. It also contains short, vivid sentences that you can easily say.
Unnati Education offers the latest NIOS Chemistry 313 solved Practical File (Lab Manual) for students who want to get the best grades. Keep copies and submit early. This will help you to walk into the practical calmly, rather than in a state of chaos.