STYX
Would you like to react to this message? Create an account in a few clicks or log in to continue.
STYX

This is a forum for Styx members
 
HomeLatest imagesSearchRegisterLog in

 

 Base (chemistry)

Go down 
AuthorMessage
tranthuongbn




Posts : 316
Join date : 2011-03-04

Base (chemistry) Empty
PostSubject: Base (chemistry)   Base (chemistry) Icon_minitimeFri Dec 02, 2011 9:29 pm

A base in chemistry is a substance that can accept hydrogen ions (protons) or more generally, donate electron pairs. A soluble base is referred to as an alkali if it contains and releases hydroxide ions (OH−) quantitatively. The Brønsted-Lowry theory defines bases as proton (hydrogen ion) acceptors, while the more general Lewis theory defines bases as electron pair donors, allowing other Lewis acids than protons to be included.[1] The oldest Arrhenius theory defines bases as hydroxide anions,[2] which is strictly applicable only to alkali. In water, by altering the autoionization equilibrium, bases give solutions with a hydrogen ion activity lower than that of pure water, i.e. a pH higher than 7.0 at standard conditions. Examples of common bases are sodium hydroxide and ammonia. Metal oxides, hydroxides and especially alkoxides are basic, and counteranions of weak acids are weak bases.

pubblicità online
Full color custom printed mouse pads for advertising your business
Back to top Go down
 
Base (chemistry)
Back to top 
Page 1 of 1
 Similar topics
-
» Neutralization (chemistry)
» Stolen base

Permissions in this forum:You cannot reply to topics in this forum
STYX :: General (Public Area) :: Guild Affiliated :: Styx Guild-
Jump to: