Classify each of the following substances into an acid or base or both and mention the concept/concepts on the basis of which you can do so. (i) HCl(aq) " " (ii) NH_(3)(g) " " (iii) Na_(2)CO_(3)(aq) " " (iv)CH_(3)CO OH(aq) (v)CO_(2)(g) " " (vi)BF_(3) " " (vii)Ag^(+) " " (viii)CN^(-) (ix)H_(2)O " " (x)H_(2)SO_(4) "(xi)" HCO_(3)^(-) "(xii)"SiF_(4)

Classify each of the following substances into an acid or base or both

1.	Classify each of the following substances into an acid or base or both and mention the concept/concepts on the basis of which you can do so. (i) HCl(aq) " " (ii) NH_(3)(g) " " (iii) Na_(2)CO_(3)(aq) " " (iv)CH_(3)CO OH(aq) (v)CO_(2)(g) " " (vi)BF_(3) " " (vii)Ag^(+) " " (viii)CN^(-) (ix)H_(2)O " " (x)H_(2)SO_(4) "(xi)" HCO_(3)^(-) "(xii)"SiF_(4)
Answer» Solution :(i) HCL (aq) - Acid (ARRHENIUS conecpt and Bronsted - LOWRY concept) (ii) `NH_(3)(g) `-Base (Bronsted concept and Lewis concept) (iii) `Na_(2)CO_(3)(aq)`- Base (Bronsted concept) (iv) `CH_(3)CO OH(aq)`-Acid (Arrhenius concept and Bronsted concept) (V) `CO_(2)(g)`-Acid (Bronsted concept and Lewis concept) (vi) `BF_(3)`-Acid (Lewis concept) (vii) `Ag^(+)`- Acid (Lewis concept) (viii) `CN^(-)`- Base (Lewis concept) (ix) `H_(2)O`- Both acid and base, i.e., amphoteric (Bronsted concept) (x) `H_(2)SO_(4)`-Both acid and base, i.e., amphoteric (Bronsted concept) (xi) `CHO_(3)^(-)`-Both acid and base, i.e., amphoteric (Bronsted concept) (xii) `SiF_(4) ` - Acid (Lewis concept), as silicon can expand its octet .