Question

The active ingredient in aspirin is acetylsalicylic acid. In a lab class, a student uses paper chromatography to isolate another common ingredient of headache remedies. The sample of this ingredient had a mass of 384 mg and a volume of 0.32 cm3. Looking at the following data, what was the other ingredient in the headache remedy? White table sugar Caffeine Sodium Chloride D -0.70 g/mL D 1.2 g/mL D 2.2 g/mL

Answer 1

Answer: Caffeine

Step-by-step explanation:

Density is defined as the ratio of mass of object to its volume. The mathematical expression of density is given as:

`\text{Density of substance}=\frac{\text{Mass of a substance}}{\text{Volume of a substance}}`

We are given:

Mass of ingredient= 384 mg =
`(384)/(1000)=0.384g` (1g=1000mg)

Volume of ingredient=
`0.32cm^3=0.32mL=` (Conversion factor:
`1cm^3=1mL` )

Putting values in above equation, we get:

`Density =(0.384g)/(0.32ml)=1.2g/ml`

Hence, the density of ingredient is 1.2 g/ml and it is caffeine.