question_answer 27)

         Five solutions A, B, C, D and £ when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is :                                           (a) neutral ?                       (b) strongly alkaline?      (c) strongly acidic?           (d) weakly acidic?                                           (e) weakly alkaline?                                        (f) Arrange the pH in increasing order of hydrogen-ion concentration.    

Answer:

(a) Solution D is neutral (pH =7)                                           (b) Solution C is strongly alkaline (pH =11)                                          (c) Solution B is weakly acidic (pH =1)                                          (d) Solution A is strongly acidic (pH = 4)                                        Solution E is weakly alkaline (pH = 9)               pH in the increasing order of hydrogen ion concentration: pH=11 < pH=9 < pH=7 < pH=4 < pH=1