Which substance forms when carbon dioxide dissolves in water?
Solution 10SAQ:Ans. (d)Step-1When carbon dioxide reacts with water, a weak acid is formed i.e carbonic acid (H CO ) 2 3CO +2 O 2 CO 2 3Step-2 (mechanism) CO i2a linear molecule with 2 electronegative oxygen atoms withdrawing electron densityfrom the central C atom. This makes it an electrophile, it wants some nucleophile to come in andattack it. The oxygen in water is a decent nucleophile. It’s got two lone pairs. So water comes inwith one of its lone pairs and attacks the central carbon atom in CO , kicking two electrons2f acarbon-oxygen pi bond up onto an oxygen, giving it a negative charge i.e H O (+) and COO(-). 2