1. A student was in a hurry to carry out this determination and took some shortc
ID: 548525 • Letter: 1
Question
1. A student was in a hurry to carry out this determination and took some shortcuts in doing the experiment. Briefly explain whether each of the following changes would lead to high or low results, or no change. (1) I n preparing the ASA solution for the Beer's law plot, the student added 10 mL of 1M NaOH solution but omitted heating the reaction mixture. (2) Because all the 250-mL volumetric flasks were dirty, the student diluted the stock solution of sodium salicylate in a clean 100-mL volumetric flask. When analyzing the commercial aspirin tablet, the solution was cloudy after it had However, the student went ahead and analyzed it. (3)Explanation / Answer
SOLUTION:
[15:12, 10/26/2017] Naveen komma: When you are heating the reaction will take place more faster and mix well to become homogeneous, so if you hadn't heat, reaction will occur, but not that much effectively, it will lower the concentration of solution and thereby decrease of result in absorbance.
2. Don't use stock solutions for cleaning unless you prepared excess quantity for cleaning purposes also. Otherwise it will decrease the effective volume of stock solution and concentration will also decrease. So final result will be low from your expected value for absorbance.
3. Aspirin is acetyl salicylic acid, so when you acidified, The solution become cloudy means, it will decrease the intensity of light passed through it. That is, It would not dissolved aspirin properly.
AS PER CHEGG POLICY WE WILL GIVE FIRST FULL QUESTION ANSWER THANK YOU
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.