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2006-11-08 17:48:00 · 12 answers · asked by Anonymous in Science & Mathematics Chemistry

12 answers

In the Brønsted-Lowry classification, any chemical species, ionic or molecular, capable of accepting or receiving a proton (hydrogen ion) from another substance. The other substance acts as an acid in giving up the proton. A substance may act as a base, then, only in the presence of an acid. The greater the tendency to accept a proton, the stronger the base. The hydroxyl ion acts as a strong base. Substances that ionize in aqueous solutions to produce the hydroxyl ion (OH), such as potassium hydroxide (KOH) and barium hydroxide [Ba(OH)2], are also conventionally called bases.

Any compound having highly basic properties, strong acrid taste, and ability to neutralize acids. Aqueous solutions of alkalies are high in hydroxyl ions, have a pH above 7, and turn litmus paper from red to blue. Caustic alkalies include sodium hydroxide (caustic soda), the sixth-largest-volume chemical produced in the United States, and potassium hydroxide. They are extremely destructive to human tissue; external burns should be washed with large amounts of water. The milder alkalies are the carbonates of the alkali metals; these include the industrially important sodium carbonate (soda ash) and potassium carbonate (potash), as well as the carbonates of lithium, rubidium, and cesium, and the volatile ammonium hydroxide. Sodium bicarbonate is a still milder alkaline material.

In Summary base is a general word (carbonates, hydroxides ...of alkali metals, alkaline earth metals, Transition metals) and alkali is used specifically for carbonates, hydroxides... of alkali group metals.

2006-11-09 01:01:56 · answer #1 · answered by Anonymous · 2 1

The terms are often used interchangeably, but strictly speaking an alkali is a basic, ionic salt of an alkali metal or alkali earth metal element. For example sodium hydoxide, calcium carbonate.
(Not all salts are alkalis, eg sodium chloride).

Thus organic compounds (such as ammonia, or triethylamine) which do give soluitons in water with a pH greater than 7.4 are not alkali but should be refered to as Bases.

2006-11-08 18:09:14 · answer #2 · answered by drcjs_007 3 · 1 0

All bases are comonly referred to as Alkali
The reason for this is because the "strong" basess mostly come from the GROUP I elements on the periodic table which are called the Alkali Metals as well as the Second group the Alkali Earth Metals, All Alkali are BASIC in Nature. All bases are refferred to as Alkali. Think of the word Alkali as a fancy word for BASE

2006-11-08 21:27:26 · answer #3 · answered by yonhoward 1 · 2 1

A base is a substance which reacts with an acid to neutralise its effect.Whereas an alkali is a base which is soluble in water. All alkalis are bases but all bases are not alkalis.eg:-CuO

2014-07-28 19:37:26 · answer #4 · answered by divyansh 1 · 2 0

Bases include all metal oxides and metal hydroxide. Not all bases are soluble in water. An alkali is a soluble base. Hence, all alkalis are bases, but not all bases are alkalis.

2006-11-08 18:06:48 · answer #5 · answered by orhhai 2 · 3 0

a base is a substance that has a pH between the range of 7-14.
it is bitter to taste.not all bases dissolve in water to give Hydroxyl (OH-) ions.
an alkali is a base that dissociates in water to give hydroxyl (OH-) ions.
thus all alkalies are bases but not all bases may be alkalies.
the more an alkali gives hydroxyl ions in water the more strong is is said to be.

2006-11-08 17:55:33 · answer #6 · answered by shadab_ansari2005 3 · 4 0

Bases are substances that react with acids and neutralise them. They are usually metal oxides, metal hydroxides, metal carbonates or metal hydrogen carbonates. Many bases are insoluble - they do not dissolve in water. If a base does dissolve in water, we call it an alkali.

2015-05-23 05:39:08 · answer #7 · answered by somia 1 · 1 0

Base. alkali; alkaline; basic. Compare with acid*.
1. a compound that reacts with an acid* to form a salt*. 2. a compound that produces hydroxide ions in aqueous solution (Arrhenius). 3. a molecule or ion that captures hydrogen ions.(Bronsted-Lowry). 4. a molecule or ion that donates an electron pair to form a chemical bond.(Lewis)

2006-11-08 17:57:15 · answer #8 · answered by kckboozer 2 · 1 1

well metal oxides are bases and alkalies are those metal oxides
which can dissolve in water.so all alkalies are bases which can dissolve in water.

2006-11-09 00:40:31 · answer #9 · answered by Anonymous · 1 1

base is alkali

2006-11-08 21:25:03 · answer #10 · answered by ? 7 · 1 2

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