question_answer

  Five solutions A, B, C, D and E 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? Arrange the pH in increasing order of hydrogen ion concentration.         [NCERT]

Answer:

                  When a cold and concentrated solution of sodium chloride reacts with ammonia and carbon dioxide, sodium hydrogen carbonate and ammonium chloride is formed.