![]() ![]() ![]() But precipitous and precipitously are also frequently used to mean "abrupt, hasty," which takes them into territory that would ordinarily belong to precipitate and precipitately: their precipitous decision to leave. ![]() Precipitous currently means "steep" in both literal and figurative senses: the precipitous rapids of the upper river a precipitous drop in commodity prices. So we might predict that a non-polar solvent that doesn't dissolve salts would be a bad solvent for a double replacement reaction.Usage Note: The adjective precipitate and the adverb precipitately were once applied to physical steepness but are now used primarily of rash, headlong actions: Their precipitate entry into the foreign markets led to disaster. The more you know about how the reaction occurs, and the more you know about the properties of different solvents (like their polarity), the more educated of a guess you can make! For example, in double replacement reactions, we know that the solubility of the reactants is important because we need free ions around. In general, it's tricky to predict for any random reaction what medium it might need. Water is a really great solvent whenever you want to have ions around. Double replacement reactions always occur in water, with the reactants in the aqueous state. Luckily, there aren't that many strong acids and bases, and you can learn morem about this from this video: Īnything that is soluble in water and dissolved (separated into individual cations and anions) is in the aqueous state. It is helpful to have the strong acids and bases memorized, since they have special reactivity. The cation (or positively charged ion) of the salt comes from the base, and the anion (or negatively charged ion) comes from the acid. If you have tried this reaction at home, you probably remember a lot of fizzing because the neutralization reaction is accompanied by a gas-producing reaction, where the carbonic acid decomposes into carbon dioxide gas-bubbles!-and water.Ī salt is generally any ionic compound, though I have also seen it defined as an ionic compound that is formed when you react an acid and a base. A + B − + C + D − → A + D − + C + B − \greenD NaCH 3 COO start text, N, a, C, H, end text, start subscript, 3, end subscript, start text, C, O, O, end text. ![]()
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