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Cupcakes baked with baking soda as a raising agent. 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 −).
Alkalinity (from Arabic: القلوية, romanized: al-qaly, lit. 'ashes of the saltwort') [1] is the capacity of water to resist acidification. [2] It should not be confused with basicity, which is an absolute measurement on the pH scale. Alkalinity is the strength of a buffer solution composed of weak acids and their conjugate bases.
The most common salt of the bicarbonate ion is sodium bicarbonate, NaHCO 3, which is commonly known as baking soda. When heated or exposed to an acid such as acetic acid , sodium bicarbonate releases carbon dioxide. This is used as a leavening agent in baking. [11]
It is made up of baking soda and a dry acid. When it comes into contact with liquid, gas (CO2) bubbles are released. Gas is released a second time when it is heated; hence the name "double acting ...
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The measurement of pH can become difficult at extremely acidic or alkaline conditions, such as below pH 2.5 (ca. 0.003 mol/dm 3 acid) or above pH 10.5 (above ca. 0.0003 mol/dm 3 alkaline). This is due to the breakdown of the Nernst equation in such conditions when using a glass electrode.
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