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The white packets contained tartaric acid, and the blue packets contained a mixture of 75% w/w Rochelle salt (potassium sodium tartrate) and 25% baking soda (sodium bicarbonate). The powdery contents of both packets were stirred or dissolved separately in water and then mixed, giving off carbon dioxide with a characteristic fizzing sound. [3]
The dissolvable packets are typically made of polyvinyl alcohol (PVA) or a derivative of PVA. Although the formulas are similar, the concentration varies; the liquid components of a detergent pod may contain 10% water compared to 50% in liquid detergents. [2] The film is designed to be soluble in cold water. [3]
Sodium bicarbonate (IUPAC name: sodium hydrogencarbonate [9]), commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO 3. It is a salt composed of a sodium cation (Na +) and a bicarbonate anion (HCO 3 −). Sodium bicarbonate is a white solid that is crystalline but often appears as a
Purple-K, also known as PKP, is a dry-chemical fire suppression agent used in some dry chemical fire extinguishers. [1] It is the second most effective dry chemical in fighting class B (flammable liquid) fires after Monnex (potassium allophanate), and can be used against some energized electrical equipment fires (USA class C fires). [2]
Baking powder is made up of a base, an acid, and a buffering material to prevent the acid and base from reacting before their intended use. [5] [6] Most commercially available baking powders are made up of sodium bicarbonate (NaHCO 3, also known as baking soda or bicarbonate of soda) and one or more acid salts.
The carbon dioxide is generated by a reaction of a compound containing bicarbonate, such as sodium bicarbonate or magnesium bicarbonate, with an acid such as citric acid or tartaric acid. Both compounds are present in the tablet in powder form and start reacting as soon as they dissolve in water. [1] [2] [3] [4]
Alka-Seltzer is a combination of sodium bicarbonate, aspirin, and anhydrous citric acid used for the relief of heartburn, acid indigestion, and stomach aches. [7] Alka-Seltzer is sold in foil packets, each containing two tablets. Prior to 1984, it was also available stacked in cylindrical glass bottles. It is available in many different flavors.
The digestive biscuit is also used as a cracker with cheeses, and is often included in "cracker selection" packets. In the UK, McVitie's digestive is the best selling biscuit, with 80 million packs sold annually, [ 1 ] though there are many other popular brands (such as Cadbury ’s) as well as supermarkets' own versions. [ 8 ]
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