- published: 07 Oct 2011
- views: 185
An acid (from the Latin acidus/acēre meaning sour) is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and bases like sodium carbonate. Aqueous acids have a pH of less than 7, where an acid of lower pH is typically stronger. Chemicals or substances having the property of an acid are said to be acidic.
Common examples of acids include acetic acid (in vinegar), sulfuric acid (used in car batteries), and tartaric acid (used in baking). As these three examples show, acids can be solutions, liquids, or solids. Gases such as hydrogen chloride can be acids as well. Strong acids and some concentrated weak acids are corrosive, but there are exceptions such as carboranes and boric acid.
There are three common definitions for acids: the Arrhenius definition, the Brønsted-Lowry definition, and the Lewis definition. The Arrhenius definition states that acids are substances which increase the concentration of hydronium ions (H3O+) in solution. The Brønsted-Lowry definition is an expansion: an acid is a substance which can act as a proton donor. Most acids encountered in everyday life are aqueous solutions, or can be dissolved in water, and these two definitions are most relevant. The reason why pHs of acids are less than 7 is that the concentration of hydronium ions is greater than 10−7moles per liter. Since pH is defined as the negative logarithm of the concentration of hydronium ions, acids thus have pHs of less than 7. By the Brønsted-Lowry definition, any compound which can easily be deprotonated can be considered an acid. Examples include alcohols and amines which contain O-H or N-H fragments.
The "Deutschlandlied" ("Song of Germany", German pronunciation: [ˈdɔʏtʃlantˌliːt]; also known as "Das Lied der Deutschen" or "The Song of the Germans"), has been used wholly or partially as the national anthem of Germany since 1922. The music was written by Joseph Haydn in 1797 as an anthem for the birthday of the Austrian Emperor Francis II of the Holy Roman Empire. In 1841, the German linguist and poet August Heinrich Hoffmann von Fallersleben wrote the lyrics of "Das Lied der Deutschen" to Haydn's melody, lyrics that were considered revolutionary at the time.
The song is also well known by the opening words and refrain of the first stanza, "Deutschland, Deutschland über alles" (literally, "Germany, Germany above all"), but this has never been its title. The line "Germany, Germany above all" meant that the most important goal of the Vormärz revolutionaries should be a unified Germany overcoming the perceived anti-liberal Kleinstaaterei. Alongside the Flag of Germany it was one of the symbols of the March Revolution of 1848.
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