Practicals
CHEMISTRY PRACTICALS
CLASS-XII
EXPERIMENT No. 1
AIM – (a) To prepare 100ml of M/20 solution of oxalic acid. (b)Using this calculate the molarity and strength of the given KMnO4 solution. APPARATUS AND CHEMICALS REQUIRED- Oxalic acid, weighing bottle, weight box, volumetric flask, funnel, distilled water, chemical balance, beakers, conical flask, funnel, burette, pipette, clamp stand, tile, dilute H2SO4, KMnO4 solution.
THEORY- (a) Oxalic acid is a dicarboxylic acid having molar mass 126gmol-1. It is a primary standard and has the molecular formula COOH-COOH.2H2O. Its equivalent mass is 126/2 = 63 as its n factor is 2 as per the following reaction: COOH-COOH → 2CO2 + 2H+ + 2e-.
Calculation of amount of oxalic acid to be weighed to prepare 100ml M/20 solution:
wt. X 1000 M = Mol. Wt V(ml)
PROCEDURE:
1. Weigh a clean dry bottle using a chemical balance.
2. Add more weights to the pan containing the weights for the weighing bottle.
3. Add oxalic acid in small amounts to the weighing bottle, so that the pans are balanced.
4. Remove the weighing bottle from the pan.
5. Using a funnel, transfer the oxalic acid to the volumetric flask.
6. Add a few drops of distilled water to dissolve the oxalic acid.
7. Make up the volume to the required level using distilled water.
8. The standard solution is prepared.
(b) THEORY-
1. The reaction between KMnO4 and oxalic acid is a redox reaction and the titration is therefore called a redox titration.
2. Oxalic acid is the reducing agent and KMnO4 is the oxidizing agent.
3. KMnO4 acts as an oxidizing agent in all the mediums; i.e. acidic, basic and neutral medium.
4. KMnO4 acts as the strongest oxidizing agent in the acidic medium and therefore dil. H2SO4 is added to the conical flask before starting the titration.
5. The titration
CLASS-XII
EXPERIMENT No. 1
AIM – (a) To prepare 100ml of M/20 solution of oxalic acid. (b)Using this calculate the molarity and strength of the given KMnO4 solution. APPARATUS AND CHEMICALS REQUIRED- Oxalic acid, weighing bottle, weight box, volumetric flask, funnel, distilled water, chemical balance, beakers, conical flask, funnel, burette, pipette, clamp stand, tile, dilute H2SO4, KMnO4 solution.
THEORY- (a) Oxalic acid is a dicarboxylic acid having molar mass 126gmol-1. It is a primary standard and has the molecular formula COOH-COOH.2H2O. Its equivalent mass is 126/2 = 63 as its n factor is 2 as per the following reaction: COOH-COOH → 2CO2 + 2H+ + 2e-.
Calculation of amount of oxalic acid to be weighed to prepare 100ml M/20 solution:
wt. X 1000 M = Mol. Wt V(ml)
PROCEDURE:
1. Weigh a clean dry bottle using a chemical balance.
2. Add more weights to the pan containing the weights for the weighing bottle.
3. Add oxalic acid in small amounts to the weighing bottle, so that the pans are balanced.
4. Remove the weighing bottle from the pan.
5. Using a funnel, transfer the oxalic acid to the volumetric flask.
6. Add a few drops of distilled water to dissolve the oxalic acid.
7. Make up the volume to the required level using distilled water.
8. The standard solution is prepared.
(b) THEORY-
1. The reaction between KMnO4 and oxalic acid is a redox reaction and the titration is therefore called a redox titration.
2. Oxalic acid is the reducing agent and KMnO4 is the oxidizing agent.
3. KMnO4 acts as an oxidizing agent in all the mediums; i.e. acidic, basic and neutral medium.
4. KMnO4 acts as the strongest oxidizing agent in the acidic medium and therefore dil. H2SO4 is added to the conical flask before starting the titration.
5. The titration