Question
Circle the correctanswer to each question below.
(a)Circle the stronger acid is the following pair: Benzoic acid(HC7H5O2) or Formic acid (HCHO2)
(b)Circle the stronger base: C7H5O2 or CHO2
(c)Predict whether an aqueous solution of Fe(NO3)3 iseither: Acidic or Basicor Neutral
(d)Predict whether an aqueous solution of NH4CN iseither: Acidic or Basic or Neutral
(e)Predict whether an aqueous solution of NH4ClO4is either: Acidic or Basic orNeutral
(f)Predict whether an aqueous solution of Na2CO3is either: Acidic or Basicor Neutral
Explanation / Answer
a) Formic acid (HCHO2) isstronger acid than Benzoic acid (HC7H5O2) as ithas greater Ka value. b) C7H5O2 is strong base thanCHO2 as it has weak conjugateacid Benzoic acid (HC7H5O2). c) Fe(NO3)3 is a neutral solution. d) NH4CN solution is basic because cyanide ionhas greater Kb value than the Ka of Ammoniumion. e) NH4ClO4 solution is acidic because Ammoniumion has greater Ka value than the Kb of perchlorateion. f) Na2CO3 solutionis basic because it contains conjugate base(carbonate) ofweak acid (bicarbonate). c) Fe(NO3)3 is a neutral solution. d) NH4CN solution is basic because cyanide ionhas greater Kb value than the Ka of Ammoniumion. e) NH4ClO4 solution is acidic because Ammoniumion has greater Ka value than the Kb of perchlorateion. f) Na2CO3 solutionis basic because it contains conjugate base(carbonate) ofweak acid (bicarbonate).