Chemistry Eggshell Lab
Eggshell Lab
Lab Set-Up:
Materials: * pipette with pipette bulb * conical flask * 1 beaker * 1 molar sodium hydroxide solution * 2 molar hydrochloric acid solution * 1 funnel * 1 piece circular filter paper * crushed poultry eggshell * crushed farm eggshell * phenolphthalein * Distilled water * White tile * Paper tray * burette in burette stand * electronic scale
Procedure:
Step 1: Standardization of the NaOH solution using Standard 0.1M PHP 1. Take 10ml of the given NaOH solution and dilute with 90ml of water. Fill up the burette with this solution. Take 10ml of 0.1M potassium hydrogen phthalate (PHP) in the conical flask, add 1-2 drops of phenolphthalein and titrate with the diluted solution of the NaOH till the solution turns light pink. 2. Calculate the strength of the original NaOH solution.
Step 2: Poultry eggshell 1. Carefully weigh (1.5- 2.5g) crushed country eggshell in a paper tray using an electronic scale. 2. Take (60 ml-80ml) of HCl and dissolve crushed eggshell in solution for eight to ten hours or until reaction between eggshell and acid is complete. 3. Rinse burette with NaOH solution and place in burette stand. 4. Rinse pipette with HCl. 5. Rinse conical flask with distilled water. 6. Filter acid and eggshell solution into beaker through funnel to remove unreacted HCl. (This step is necessary not for chemical reasons, but rather so that pieces of eggshell do not get stuck in the pipette during transfer of the HCl.) 7. Use a pipette to move the unreacted HCl solution into the conical flask. 8. Place two drops of phenolphthalein (color indicator) into the solution. 9. Fill burette to the zero mark with NaOH solution. 10. Place conical flask under the burette and begin adding drops of NaOH into the flask. 11. Continue this process until the solution turns light pink. At this point, the titration has reached its endpoint
Lab Set-Up:
Materials: * pipette with pipette bulb * conical flask * 1 beaker * 1 molar sodium hydroxide solution * 2 molar hydrochloric acid solution * 1 funnel * 1 piece circular filter paper * crushed poultry eggshell * crushed farm eggshell * phenolphthalein * Distilled water * White tile * Paper tray * burette in burette stand * electronic scale
Procedure:
Step 1: Standardization of the NaOH solution using Standard 0.1M PHP 1. Take 10ml of the given NaOH solution and dilute with 90ml of water. Fill up the burette with this solution. Take 10ml of 0.1M potassium hydrogen phthalate (PHP) in the conical flask, add 1-2 drops of phenolphthalein and titrate with the diluted solution of the NaOH till the solution turns light pink. 2. Calculate the strength of the original NaOH solution.
Step 2: Poultry eggshell 1. Carefully weigh (1.5- 2.5g) crushed country eggshell in a paper tray using an electronic scale. 2. Take (60 ml-80ml) of HCl and dissolve crushed eggshell in solution for eight to ten hours or until reaction between eggshell and acid is complete. 3. Rinse burette with NaOH solution and place in burette stand. 4. Rinse pipette with HCl. 5. Rinse conical flask with distilled water. 6. Filter acid and eggshell solution into beaker through funnel to remove unreacted HCl. (This step is necessary not for chemical reasons, but rather so that pieces of eggshell do not get stuck in the pipette during transfer of the HCl.) 7. Use a pipette to move the unreacted HCl solution into the conical flask. 8. Place two drops of phenolphthalein (color indicator) into the solution. 9. Fill burette to the zero mark with NaOH solution. 10. Place conical flask under the burette and begin adding drops of NaOH into the flask. 11. Continue this process until the solution turns light pink. At this point, the titration has reached its endpoint