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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
( R e d i r e c t e d f r o m A n h y d r a t e )
An acidic oxide is an oxide that either produces an acidic solution upon addition to water, or acts as an acceptor of hydroxide ions effectively functioning as a Lewis acid .[1] pK a inorganic or organic . A commonly encountered acidic oxide, carbon dioxide produces an acidic solution (and the generation of carbonic acid ) when dissolved.[2]
The acidity of an oxide can be reasonably assumed by its accompanying constituents. Less electronegative elements tend to form basic oxides such as sodium oxide and magnesium oxide , whereas more electronegative elements tend to produce acidic oxides as seen with carbon dioxide and phosphorus pentoxide . Some oxides like aluminium oxides are amphoteric .[3]
Acidic oxides are of environmental concern. Sulfur and nitrogen oxides are considered air pollutants as they react with atmospheric water vapour to produce acid rain .
Examples
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Carbonic acid is an illustrative example of the Lewis acidity of an acidic oxide.
CO 2 − ⇌ HCO3 − + OH− ⇌ CO3 2− + H2 O
This property is a key reason for keeping alkali chemicals well sealed from the atmosphere, as long-term exposure to carbon dioxide in the air can degrade the material.
H 2 CO 3 2 2
CrO3 2 2 4
N 2 O 5 2 3
Mn 2 O 7 2 4
Further examples
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Aluminium oxide
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Aluminium oxide (Al 2 O 3 amphoteric oxide; it can act as a base or acid. For example, with base different aluminate salts will be formed:
Al 2 O 3 2 OH )4
Silicon dioxide
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Silicon dioxide is an acidic oxide. It will react with strong bases to form silicate salts.[4]
Silicon dioxide is the anhydride of silicic acid :
H 4 4 2 2
Phosphorus oxides
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Phosphorus(III) oxide reacts to form phosphorous acid in water:
P 4 O 6 2 3 PO 3
Phosphorus(V ) oxide reacts with water to give phosphoric acid :
P 4 O 10 2 3 PO 4
Sulfur oxides
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Sulfur dioxide reacts with water to form the weak acid, sulfurous acid :
SO 2 2 2 SO 3
Sulfur trioxide forms the strong acid sulfuric acid with water:
SO 3 2 2 SO 4
This reaction is important in the manufacturing of sulfuric acid.
Chlorine oxides
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Chlorine(I ) oxide reacts with water to form hypochlorous acid , a very weak acid:
Cl 2 2
Chlorine(VII) oxide reacts with water to form perchloric acid , a strong acid:
Cl 2 O 7 2 4
Iron oxides
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Iron(II ) oxide is the anhydride of the aqueous ferrous ion:
[Fe(H 2 O )6 2+ → FeO + 2 H+ + 5 H2 O
Chromium oxides
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Chromium trioxide is the anhydride of chromic acid :
H 2 4 2 3
Vanadium oxides
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Vanadium trioxide is the anhydride of vanadous acid :
2H3 VO 3 2 2 O 3
Vanadium pentoxide is the anhydride of vanadic acid :
2H3 VO 4 2 2 O 5
See also
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References
[ edit ]
^ Chang, Raymond; Overby, Jason (2011). General chemistry: the essential concepts (6th ed.). New York, NY: McGraw-Hill . ISBN 9780073375632 OCLC 435711011 .
^ Comprehensive Chemistry Volume 1 . New Delhi, India: Laxmi Publications. 2018. p. 6.13. ISBN 978-81-318-0859-7
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Acidic_oxide&oldid=1221297132 " C a t e g o r y : ● A c i d i c o x i d e s H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n i s d i f f e r e n t f r o m W i k i d a t a
● T h i s p a g e w a s l a s t e d i t e d o n 2 9 A p r i l 2 0 2 4 , a t 0 2 : 0 9 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
