Acid–base reaction are crucial in both bionaipublishers.comistry and also industrial naipublishers.comistry. Moreover, countless of the substances us encounter in our homes, the supermarket, and the pharmacy space acids or bases. For example, aspirin is an mountain (acetylsalicylic acid), and also antacids room bases. In fact, every amateur chef who has actually prepared mayonnaise or squeezed a wedge that lemon to marinate a piece of fish has lugged out an acid–base reaction. Before we discuss the attributes of such reactions, let’s first describe several of the nature of acids and bases.

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## Definitions the Acids and also Bases

We can specify acids together substances that dissolve in water to create H+ ions, whereas bases are characterized as substances the dissolve in water to develop OH− ions. In fact, this is only one possible set that definitions. Although the basic properties the acids and also bases have been well-known for more than a thousands years, the interpretations of acid and also base have adjusted dramatically as scientists have actually learned an ext about them. In old times, an mountain was any type of substance that had a tart taste (e.g., vinegar or lemon juice), caused constant color alters in dyes acquired from tree (e.g., turning blue litmus paper red), reaction with details metals to create hydrogen gas and also a systems of a salt include a metal cation, and also dissolved carbonate salts such together limestone (CaCO3) v the evolution of carbon dioxide. In contrast, a basic was any type of substance that had actually a bitterness taste, feel slippery to the touch, and also caused color changes in tree dyes that differed diametrically from the changes caused by acids (e.g., transforming red litmus document blue). Return these meanings were useful, they were totally descriptive.

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Example $$\PageIndex1$$: acid Strength

Classify every compound together a solid acid, a weak acid, a strong base, a weak base, or none of these.

CH3CH2CO2H CH3OH Sr(OH)2 CH3CH2NH2 HBrO4

Given: compound

Asked for: acid or base strength

Strategy:

A identify whether the link is organic or inorganic.

B If inorganic, identify whether the compound is acidic or straightforward by the existence of dissociable H+ or OH− ions, respectively. If organic, identify the compound together a weak basic or a weak mountain by the visibility of an amine or a carboxylic acid group, respectively. Recall that all polyprotic acids other than H2SO4 space weak acids.

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Solution:

A This compound is propionic acid, i m sorry is organic. B It consists of a carboxylic acid team analogous to that in acetic acid, therefore it have to be a weak acid. A CH3OH is methanol, an organic compound that consists of the −OH group. B as a covalent compound, that does not dissociate to form the OH− ion. Due to the fact that it does not contain a carboxylic mountain (−CO2H) group, methanol also cannot dissociate to form H+(aq) ions. For this reason we predict the in aqueous solution methanol is no an mountain nor a base. A Sr(OH)2 is an not natural compound that has one Sr2+ and also two OH− ions per formula unit. B We because of this expect it to be a strong base, similar to Ca(OH)2. A CH3CH2NH2 is one amine (ethylamine), one organic compound in which one hydrogen that ammonia has been changed by one R group. B Consequently, we intend it to behave likewise to ammonia (Equation $$\ref4.3.7$$), reacting with water come produce tiny amounts of the OH− ion. Ethylamine is therefore a weak base. A HBrO4 is perbromic acid, an inorganic compound. B it is not listed in Table $$\PageIndex1$$ as among the common solid acids, however that does not necessarily mean that it is a weak acid. If you examine the routine table, you can see that Br lies directly below Cl in group 17. We might thus expect that HBrO4 is naipublishers.comically similar to HClO4, a strong acid—and, in fact, it is.