What would be an acceptable measurement to make with the buret shown? 69. 70. Sa

Question

What would be an acceptable measurement to make with the buret shown? 69. 70. Salicylic acid is a common Sample Absorbance impurity in aspirin. Below is a Beer's Law plot of the absorbance vs. the concentration of salicylic acid. The absorbance of two different aspirin samples are in the table. What can you conclude about samples A and B assuming the only possible impurity is salicylic acid? 0.26 0.65 30 3 1 1.5 (A) 30.3 mL (C) 31.7 mL (B) 30.33 mL (D) 31.67 mL 0.5 Salicylic Acid] (M) (A) The concentration of salicylic acid in sample A is (B) The concentration of salicylic acid in sample B is (C) The purity of aspirin in sample A is higher than in (D) The concentration of salicylic acid in sample A is 1.0 M. 0.4 M sample B. greater than in sample B.

Explanation / Answer

Q69. Correct answer is (A) 30.3 mL

Q70. Correct answer is (C) The purity of aspirin in sample A is higher than in sample B

Explanation

Q69. We can easily see that the lower miniscus of the liquid level is exactly at 30.3 mL

Q70. The given plot is of concentration of salicylic acid in aspirin. More the concentration of salicylic acid, more impure the sample is.

Also absorbance is directly proportional to concentration of sample.

Since absorbance of sample A is lower than absorbance of sample B, we can safely say that concentration of salicylic acid in sample A is less than concentration of salicylic acid in sample B.

Because of lower concentration of salicylic acid, sample A is more pure than sample B

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