Part A) Concentration of aspirin in test tube before reaction= 0.0327 mol/L Part
ID: 528656 • Letter: P
Question
Part A) Concentration of aspirin in test tube before reaction= 0.0327 mol/L
Part B) Concentration of salicylic acid in stock solution= 0.0116 mol/L
A calibration curve was prepared by plotting vs. Concentration and the plot is: Absorbance 0.4 y 30166x 0.0036 0.35 0.3 8 0.25 0.2 0.15 0.1 0.05 0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 0.0014 Sal, mol/I a) Complete the data table on the previous page. b) Describe the method that will be used to make the Standard Solution 2, specifying what device will be used and how. a) Using the calibration equation, what is the concentration of the salicylic acid obtained by degrading the aspirin (test tube) in part (A) on the previous page? concentration of the salicylic acid in test tube mol/L D. Calculate the rate of reaction for the aspirin degradation at 92 ec using the following equation: Rate of reaction A[Sall/Att Rate of reaction mol/L. sExplanation / Answer
Standard chemical solutions can be prepared to weight or volume. The elimination of glass volumetric flasks may be necessary to eliminate certain contamination issues with the use of borosilicate glass or to avoid chemical attack of the glass. It is often assumed that 100 grams of an aqueous solution is close enough to 100 mL to not make a significant difference since the density of water at room temperature is very close to 1.00 (0.998203 at 20.0 °C). Diluting / preparing standard solutions by weight is much easier.
For quality assurance, with respect to instruments and other equipment the following requirements should be met:
1. Apparatus used for generation of data, and for controlling environmental factors relevant to the study should be suitably located and of appropriate design and adequate capacity.
2. The apparatus used should be periodically inspected, cleaned, maintained, and calibrated according to Standard Operating Procedures. Records of procedures should be maintained.
In practice, therefore, a number of record forms and instructions need to be prepared.