Chemistry Practical Work for NEB Grade 12 Students
The practical work in our chemistry course is designed to provide students with hands-on learning experiences that reinforce the theoretical concepts taught in class. This practical component of the curriculum emphasizes skill development and application of knowledge through experimentation and analysis. Students will engage in a variety of activities aimed at enhancing their understanding of chemical principles and techniques.
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Objectives of Practical Work:
- To develop practical skills in handling chemical materials and equipment.
- To reinforce theoretical concepts through practical application.
- To enhance observational and investigative skills.
- To promote critical thinking and problem-solving abilities.
- To prepare students for future scientific research and careers in chemistry.
List of Experiments:
| Experiment No. | Experiment Title |
|---|---|
| Recovery and Preparation of Salt | |
| 1 | To recover blue vitriol crystals from the given mixture of copper sulphate and sodium chloride. |
| 2 | To recover CaCO3 from the mixture of CaCO3 and MgCO3 (dolomite). |
| 3 | To obtain hydrated calcium sulphate from the given marble chips. |
| Volumetric Analysis (Titration) | |
| 4 | To prepare primary standard solution of Na2CO3 and standardize the given acid solution (HCl) by the standard solution. |
| 5 | To determine the strength of approximate N/10 NaOH solution with the help of standard decinormal solution of HCl supplied. |
| 6 | To determine the strength of bench sulphuric acid (H2SO4) with the help of standard NaOH or Na2CO3 solution and express the concentration in (i) normality (ii) molarity (iii) gm/litre (iv) percentage (Double titration). |
| 7 | To standardize the given approximate N/10 KMnO4 standard oxalic solution (Redox titration). | Organic Chemistry |
| 8 | To detect foreign elements present in a given organic compounds (N, S and X). |
| 9 | To identify the functional group present in the organic compounds (-OH, -COOH, CHO, –CO–,–NH2), and –COO–). |
| 10 | To test the presence of: a) Saturated or unsaturated fats b) Carbohydrates c) Proteins d) Phenol |
| Thermochemistry | |
| 11 | To determine the enthalpy of neutralization of a strong acid and strong base. |
| 12 | To determine the molar enthalpy change of ammonium chloride solution. |
| Chemical Kinetics | |
| 13 | To study the kinetics of the reaction between sodium thiosulphate and hydrochloric acid. |
| 14 | To study the kinetics of the reaction between propanone and iodine. |
| Salt Analysis | |
| 15 | To perform complete salt analysis to detect the acid and basic radicals present in the given inorganic salt. |
| Applied Analytical Chemistry | |
| 16 | To separate the components of ink by paper chromatography and determine the Rf values. |
| 17 | To determine the contents of acetic acid in the given volume of vinegar by titrimetric analysis. |
| 18 |
To prepare some common compounds: a. Potash alum b. Iodoform reagent c. Fehling's solution |
| 19 | To isolate hippuric acid from given sample of cow urine. |
| 20 | To demonstrate the pH value of unknown sample solutions. |
Conclusion:
The practical work in our chemistry course is essential for students to develop a deeper understanding of chemical principles and techniques. Through these experiments, students will not only enhance their practical skills but also gain a deeper appreciation for the application of chemistry in various fields.