An alkaline is an important base used for the laboratory work. Name the base and state how it can be prepared from the common salt
Answers
Answer:
i have some paragraphs you can find this answer somewhere
Explanation:
The word "alkali" is derived from Arabic al qalīy (or alkali),[1] meaning the calcined ashes (see calcination), referring to the original source of alkaline substances. A water-extract of burned plant ashes, called potash and composed mostly of potassium carbonate, was mildly basic. After heating this substance with calcium hydroxide (slaked lime), a far more strongly basic substance known as caustic potash (potassium hydroxide) was produced. Caustic potash was traditionally used in conjunction with animal fats to produce soft soaps, one of the caustic processes that rendered soaps from fats in the process of saponification, one known since antiquity. Plant potash lent the name to the element potassium, which was first derived from caustic potash, and also gave potassium its chemical symbol K (from the German name Kalium), which ultimately derived from alkali.Common properties of alkalis and bases
Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH−) when dissolved in water. Common properties of alkaline aqueous solutions include:
Moderately concentrated solutions (over 10−3 M) have a pH of 7.1 or greater. This means that they will turn phenolphthalein from colorless to pink.
Concentrated solutions are caustic (causing chemical burns).
Alkaline solutions are slippery or soapy to the touch, due to the saponification of the fatty substances on the surface of the skin.
Alkalis are normally water-soluble, although some like barium carbonate are only soluble when reacting with an acidic aqueous solution.
Difference between alkali and base
The terms "base" and "alkali" are often used interchangeably, particularly outside the context of chemistry and chemical engineering.
There are various more specific definitions for the concept of an alkali. Alkalis are usually defined as a subset of the bases. One of two subsets is commonly chosen.
A basic salt of an alkali metal or alkaline earth metal[2] (This includes Mg(OH)2 but excludes NH3.)
Any base that is soluble in water and forms hydroxide ions[3][4] or the solution of a base in water.[5] (This includes Mg(OH)2 and NH3.)
The second subset of bases is also called an "Arrhenius base".
Alkali salts
Alkali salts are soluble hydroxides of alkali metals and alkaline earth metals, of which common examples are:
Sodium hydroxide – often called "caustic soda"
Potassium hydroxide – commonly called "caustic potash"
Lye – generic term for either of the previous two or even for a mixture
Calcium hydroxide – saturated solution known as "limewater"
Magnesium hydroxide – an atypical alkali since it has low solubility in water (although the dissolved portion is considered a strong base due to complete dissociation of its ions)