Weak acids are partially ionized in aqueous solutions. The ionization constants of some acids are given below. Arrange these acids in increasing order of their acid strength. Index Acid Ionisation constant (K_a) 1 Formic acid (HCOOH) 1.8 imes10^{-4} 2 Hypochlorous acid (HClO) 3.0 imes10^{-8} 3 Nitrous acid (HNO_2) 4.5 imes10^{-4} 4 Hydrocyanic acid (HCN) 4.9 imes10^{-10}

Question

Weak acids are partially ionized in aqueous solutions. The ionization constants of some acids are given below. Arrange these acids in increasing order of their acid strength. Index Acid Ionisation constant (K_a) 1 Formic acid (HCOOH) 1.8	imes10^{-4} 2 Hypochlorous acid (HClO) 3.0	imes10^{-8} 3 Nitrous acid (HNO_2) 4.5	imes10^{-4} 4 Hydrocyanic acid (HCN) 4.9	imes10^{-10}

Examsnet · Accepted Answer

Correct Answer is : 4 < 2 < 1 < 3

Index	Acid	Ionisation constant (Ka)
1	Formic acid (HCOOH)	1.8×10−4
2	Hypochlorous acid (HClO)	3.0×10−8
3	Nitrous acid (HNO2)	4.5×10−4
4	Hydrocyanic acid (HCN)	4.9×10−10

AP EAMCET Engineering 22 Sep 2020 Shift 2 Paper