Title: Interactive Video

Question 1

Q: What is a likely reason that salicylic acid (instead of acetylsalicylic acid) is chosen to prepare standard solutions.
- Salicylic acid is less expensive than acetylsalicylic acid. (correct)
- Acetylsalicylic acid only comes in tablet form.
- Acetylsalicylic acid can only be purchased from a pharmacy.
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Feedback (100 to 100%): Good guess - Fisher-scientific sells 99% pure salicylic acid for $45.62/500 g and 99% pure acetylsalicylic acid for $84.66/500 g.

Question 2

Salicylic acid std

Assuming that a mass of salicylic acid of 0.1123 g was quantitatively transferred to a 250.0 mL volumetric flask, calculate the concenteration of this standard solution to the correct number of significant figures. The molar mass for salicylic acid is 138.121 g/mol. Please express your answer using scientific notation (e.g., 4.321e-2).

Q: Concentration of salicylic acid: [...] M
A: 3.252e-3/3.251e-3/3.253e-3
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Feedback (100 to 100%): Good job on the calculation!

Question 3

Based on the plot of Absorbance versus Wavelength, make an estimate of the wavelength max in nm.

Q: Wavelength max (3 significant figures):[...] nm
A: 532/533/534/535/536/537/538/539/540/540./541/542/543
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Feedback (100 to 100%): Good job at reading the graph!

Choose the correct statement.