posted by Neha on .
Rank the following solutions in order of increasing acidity.
1 M phenol
1 M boric acid
1 M cyanic acid
1 M formic acid
1 M hydrochloric acid
2. Rank the following solutions in order of increasing basicity.
1 M C3H5O3Na
1 M KF
1 M KOCN
1 M KOCl
All I know is that HCl is the strongest acid. I'm really lost and would appreciate some urgent help.
You're right. HCl is the strongest acid. Note that all of the other acids are weak and have a Ka. Look in your text for Ka for each. Then rank the Ka values from weak to strong. The smallest Ka will be the weakest acid.
#2. All of these are salts and K^+ is not hydrolyzed. The anion of each is hydrolyzed. Kb for each anion = Kw/Ka where H2 = 1E-14 and Ka is the Ka for the corresponding acid; e.g., KOCl is HOCl for Ka, KOCN is HOCN for Ka, etc. The value of Kb (Kw/Ka) will give you the relative strengths. Note that all anions give the weak acid + OH^- upon hydrolysis.