Mention any five material/Reagents used during chemistry practical(and their concentration) and briefly describe how you can prepare them
surely by this time you have worked with some reagents.
If not, google can help you.
Mention materials made by application of chemistry.
Here are five commonly used materials/reagents in chemistry practical, along with their concentrations and a brief description of how to prepare them:
1. Hydrochloric acid (HCl) - Concentration: 1M
Preparation: To prepare 1M HCl solution, take approximately 83.3 mL of concentrated hydrochloric acid and dilute it with distilled water to a total volume of 1 liter. Always add the acid to the water slowly while stirring with proper safety precautions as it can be hazardous.
2. Sodium hydroxide (NaOH) - Concentration: 1M
Preparation: To make a 1M NaOH solution, dissolve approximately 40 g of sodium hydroxide pellets in distilled water, ensuring complete dissolution. Add water to bring the total volume to 1 liter while stirring. Handle NaOH with caution and wear protective gloves.
3. Sulphuric acid (H2SO4) - Concentration: 0.5M
Preparation: To prepare 0.5M H2SO4, add approximately 49 g of concentrated sulfuric acid to distilled water, then dilute to a total volume of 1 liter while stirring. Remember to add the acid to the water slowly and with proper safety precautions.
4. Potassium permanganate (KMnO4) - Concentration: 0.1M
Preparation: Dissolve approximately 3.2 g of potassium permanganate crystals in distilled water. Stir well until all the crystals are dissolved, and then dilute to a total volume of 1 liter. Use caution while handling KMnO4, as it stains and can be corrosive.
5. Copper(II) sulfate (CuSO4) - Concentration: 0.1M
Preparation: Dissolve approximately 2.9 g of copper(II) sulfate pentahydrate crystals in distilled water. Stir thoroughly until all the crystals dissolve, and then adjust the volume to 1 liter by adding more distilled water. Handle the reagent carefully, avoiding contact with skin and eyes.
Always wear appropriate safety equipment, such as goggles and gloves, when handling chemicals. Additionally, ensure that you have access to proper facilities and follow institutional guidelines for chemical handling and waste disposal.