600 ASPIRINAS. Extracción de ácido acetilsalicílico de las aspirinas. Empieza el viaje.

Overview

The video introduces a planned home-chemistry series by extracting acetylsalicylic acid—the active ingredient in aspirin—from 600 tablets. Along the way, the host discusses aspirin’s history, compares two extraction setups, recrystallizes the product, and investigates why the final yield was lower than expected.

Main Ideas

• Aspirin’s origins: Willow bark contains salicin, which can be transformed in the body into salicylic acid. In the 19th century, researchers investigated salicylic acid and other compounds used to relieve fever and pain. Bayer chemists developed acetylsalicylic acid, which was marketed as aspirin.
• What’s in a tablet: The active ingredient is acetylsalicylic acid. The tablets also contain excipients—in this case, powdered cellulose and corn starch—that provide structure and affect how the tablets dissolve.
• The larger project: The host aims to make compounds from everyday materials and products rather than simply buying chemical precursors. Extracting aspirin’s active ingredient is presented as the first step in a longer series.
• Aspirin and bleeding: Aspirin can inhibit platelet activity and make blood take longer to clot. The host describes a personal experiment after taking a high dose for two days, but says the results were inconclusive. The experiment also caused ringing in his ears. This is a personal account, not a recommendation to take aspirin at high doses.

Extraction and Purification

1. The host bought 30 boxes of aspirin from multiple pharmacies, then removed and divided the tablets into two equal groups of 300.
2. The tablets were crushed. Acetone was chosen as the extraction solvent because it dissolves acetylsalicylic acid while leaving the main tablet excipients largely undissolved.
3. Before use, the acetone was distilled. The host compared samples from different parts of the distillation using potassium permanganate as a qualitative test for reactive impurities. The distilled middle fraction appeared to react the least, suggesting that distillation had improved the solvent’s purity.
4. The two batches were processed using different setups:
   • Flask with reflux condenser: Solvent vapour was condensed and returned to the flask during heating.
   • Beaker setup: The beaker was covered with a water-filled flask to reduce evaporation and splashing. Boiling was less stable and sometimes occurred in sudden bursts.
5. Each batch was heated with acetone to dissolve the active ingredient. The mixture was filtered while hot to remove insoluble excipients, and additional acetone washes were used to recover product left among the solids.
6. The acetone was distilled off and recovered for reuse. The two methods resulted in similar solvent losses, though the host considered the flask-and-condenser method more controlled and safer.
7. The remaining solid was dissolved in hot deionized water, filtered, and cooled to crystallize the acetylsalicylic acid. The host repeated the recrystallization in three batches and reused some leftover solution to reduce losses.
8. The remaining solution and filters were processed further to recover additional material. Testing the original filters yielded only 0.72 g, indicating that the initial acetone extraction had removed nearly all the active ingredient.

Results and Interpretation

The host expected 300 g of acetylsalicylic acid based on the tablet labels. After extraction, the crude material weighed just under 290 g once glass and other non-product material were excluded.

After recrystallization and further recovery, the total was reported as 250.75 g, or 83.58% of the theoretical amount.

The host argues that ordinary handling losses are unlikely to explain the full shortfall. He suspects some acetylsalicylic acid decomposed into salicylic acid and acetic acid during the process; the vinegar-like smell was offered as a clue. This remains a hypothesis to be tested in the next video.

The host presents the procedures as educational experiments. The high-dose aspirin test is potentially dangerous and should not be treated as something to reproduce.

Speakers and Sources

• Luis Horas is the host and narrator. No guest speakers or interviewees appear in the subtitles.
• Sources and material discussed include the aspirin package leaflet, historical information about willow bark and Bayer, and the host’s own experiments. No specific external publication or interview source is identified.