What’s hiding inside aluminum cans? Just the drink, or…?
Reagents and equipment: various soft drinks in aluminum cans, sandpaper, beakers, drain cleaner, wooden rods, glass container.
Buff the top layer of paint off of the aluminum cans. Open the cans and use the wooden rods to suspend them in suitably-sized beakers. Add some drain cleaner (usually a 10% sodium or potassium hydroxide solution). Observe a tumultuous reaction and release of gas. Wait two hours. Take the cans out of the liquid. The aluminum may have dissolved, but the drinks haven’t leaked out!
These ordinary aluminum cans are concealing a devious secret – they are covered with a protective layer not only on the outside, but on the inside as well! When we remove their paint coatings, we expose the aluminum, which easily reacts with a drain cleaner that contains an alkaline component. But even when the aluminum has dissolved completely, the drinks will not leak. The cans contain a secret second material – a layer of plastic that keeps the drinks themselves from interacting with the aluminum.
Carbonated drinks contain what are known as “acidity regulators,” the most popular of which are orthophosphoric and citric acids. They are used to acidify foods, giving them a sour and slightly bitter taste. These acids can react with various metals, including the aluminum comprising the soda cans. A special plastic coating is therefore applied to the inside of the cans to prevent the two from interacting. This plastic is most often an epoxy resin (polyethylene, polypropylene, polyester, or other polymers may be used in some cases). These extremely-prevalent epoxy resins contain bisphenol A (BPA), a substance that usually evokes a mixed reaction from consumers. Bisphenol A has the ability to mimic natural human hormones; namely, it is structurally similar to estrogen. Over the past 20 years, it has undergone thorough investigation to determine any effects it may have on the human body. According to extensive research and risk assessments conducted by both governmental and independent organizations worldwide, bisphenol A is safe at normal everyday levels of exposure from food and beverage containers. A Canadian Department of Health report concluded that an average adult would need to consume 940 canned drinks in one day to even get close to the “tolerable daily intake” limit for BPA exposure.
When the aluminum cans are processed for recycling, the films burn up at the high temperatures in the convection furnaces.
2Al 2NaOH 6H2O = 2Na[Al(OH)4] 3H2
Safety precautions: wear protective gloves, glasses, and a mask. Work in a well-ventilated area. Perform this experiment under adult supervision only!
11 views
33
8
2 weeks ago 00:06:30 1
Ring Of Solomon
2 weeks ago 00:02:53 1
Revolting Children Lyric Video | Roald Dahl’s Matilda the Musical | Netflix After School
2 weeks ago 00:18:06 1
8. Atlantis and Lemuria
2 weeks ago 00:13:39 1
Japan’s Popular Check-In Port for Cruisers + a Tip from Sailing La Vagabonde
2 weeks ago 00:03:32 1
GreedFall 2 | Dev Diary: The Music (PEGI)
2 weeks ago 00:22:10 1
Ex Witch Exposes the Danger of Speaking Like This | The Power of Silence (Erica Mukisa)
2 weeks ago 00:06:29 1
Mako & Mikal - The Warpath
2 weeks ago 00:42:40 1
Nicky Elisabeth - The Way Of Love (Continuous Mix) [@NickyElisabethMusic ]
2 weeks ago 00:03:59 1
Squid Game: Season 2 | Global Fan Theories With Cast | Netflix [ENG SUB]
2 weeks ago 00:13:35 1
As U.S. Demands Japan Obey & Punish China, Beijing Pushes Major Western Industry To Extinction
2 weeks ago 01:03:40 1
Atmospheric Sci-Fi Ambient Space Music - Cosmic Reflection
2 weeks ago 01:10:58 1
Johnny M - Let’s Go Deeper | Deep House Set
2 weeks ago 00:03:22 1
Margaret Thatcher: First Female Prime Minister of Britain | Mini Bio | Biography
2 weeks ago 00:06:16 1
Michael FK - For A Brief Moment (Extended Mix)
2 weeks ago 00:18:56 1
Rethinking Climate Change. The path to a 90% emissions reduction by 2035.
2 weeks ago 00:18:15 1
MATT GOODWIN: The Immigration Time Bomb—Elites Won’t Tell You This!
2 weeks ago 00:05:08 1
Mako - Overshare
2 weeks ago 00:47:05 1
AUTUMN EQUINOX Ancient Spiritual Meaning | FALL traditions, rituals, celebrations & sites