assuming only glassware was supplied for the original experiment, what would be the procedural change necessary to titrate 25.00mL of commercial bleaching solution.
What what the original procedure?
To titrate 25.00 mL of commercial bleaching solution using only glassware, you would need to make a procedural change by using a different indicator instead of the usual one. Let's go step by step:
1. Prepare the glassware: Make sure you have clean and dry glassware, preferably a conical flask (Erlenmeyer flask) to hold the bleaching solution during the titration.
2. Choose an appropriate indicator: In a standard titration of bleaching solution, a common indicator used is starch indicator. However, starch indicator can undergo undesirable reactions with certain types of glassware. To avoid this, you can choose an alternative indicator that is not affected by the glassware used. One such indicator is phenolphthalein, which is commonly used in acidic or neutral solutions.
3. Prepare your titrant solution: The titrant is the solution of known concentration that will be used to titrate the bleaching solution. In this case, you should prepare a solution of a known concentration of a suitable titrant. A commonly used titrant for bleaching solutions is sodium thiosulfate (Na2S2O3) solution.
4. Perform the titration: Add the 25.00 mL of commercial bleaching solution to the conical flask. Then, add a few drops of the chosen indicator (e.g., phenolphthalein) to the flask.
5. Starting the titration: Slowly add the titrant solution, drop by drop, into the flask while gently swirling the flask. The indicator will change color when the reaction between the bleaching solution and the titrant is complete.
6. Endpoint determination: Continue adding the titrant solution until the indicator reaches its endpoint. The endpoint is the point at which the color change of the indicator becomes permanent. For phenolphthalein, it changes from colorless to a light pink color.
7. Record the volume of titrant used: Once the endpoint is reached, note the volume of the titrant solution consumed. This volume is crucial for calculating the concentration of the bleaching solution.
By following these procedural changes, you can successfully titrate 25.00 mL of commercial bleaching solution using only glassware.