Question

Name Formula К. Acetic acid CH3COOH 1.8 x 10-5 Formic acid HCOOH 3.0 x 10 Hydrazoic acid HN3 1.0 x 10-5 Hydrocyanic acid HCN 6.2 x 10-10 Hypochlorous acid HOCI 6.8 x 10-8 Nitrous acid HNOL 7.4 x 104 20. (7 pts) Use the table above to answer the following questions. A. Rank the following solutions in order from the lowest to highest pH. 0.10 M CH3COO- 0.10 M HCOO 0.10 M N 0.10 M OCI pH value: B. Write the equilibrium reaction that occurs when solutions containing HNO (aq) and CN (aq) are added together. Will this reaction favor products or reactants? C. Rank the following solutions in order from the lowest to highest percent ionization: 0.0010 HCOOH 0.10 M HOCI 0.0010 M HOCI Percent ionization:

Answer 1

A) As we know stronger the acid weaker the base

Increasing order of pH

0.1M HCOO- < 0.1 M CH3COO- < 0.1 M N_{​​​​​​3}^​​​-​ < 0.1 M OCl-

B) CN^{​​​​​-}​ (aq ) + HNO_{​​​​2}(aq.) ----> HCN(aq.) + NO_{​​​​​2}^{​​​​-}​​​ (aq.)

Reaction is product favoured as weak acid is formed in product side.

C) as we know dergee of ionisation = (Ka×C)^1/2

^{0.0010 M HOCl < 0.1 M HOCl < 0.0010 HCOOH}