Here is the transcription of your notes into a word document format, including the calculation for percentage yield. Experiment 3: Preparation of Aspirin (Acetyl Salicylic Acid) 3. Procedure Salicylic acid (1.5 g) was weighed using an analytical balance and placed in a conical flask. Acetic acid (6 mL) was measured using a measuring cylinder and added to the salicylic acid in the conical flask, followed by 85% sulfuric acid (4 drops). The mixture was heated for five minutes at 90 °C in a water bath, and water (20 mL) was added when the mixture was still hot. The hot mixture was allowed to stand until crystallization started. The flask was then transferred and cooled in an ice bath, and the crystals were filtered. The crystal was recrystallized from hot water by adding hot water (15 mL) until crystals formed as the hot water cooled. The crystals were dried by pressing them between filter papers and weighed using an analytical balance. 5. Calculations Theoretical Yield of Aspirin: From previous calculations, the theoretical yield of aspirin was $1.96 \text{ g}$. Percentage Yield: The actual yield of aspirin obtained was $1.5 \text{ g}$. $$ \text{Percentage Yield} = \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100\% $$ $$ \text{Percentage Yield} = \frac{1.5 \text{ g}}{1.96 \text{ g}} \times 100\% $$ $$ \text{Percentage Yield} = 0.7653 \times 100\% $$ $$ \text{Percentage Yield} = 76.53\% $$ The percentage yield was $\boxed{\textbf{76.53\%}}$. 6. Results Mass of Aspirin: 1.5 g* Melting Point: 140 °C* Percentage Yield: 76.53%* Last free one today — make it count tomorrow, or type /upgrade for unlimited.