Account for the following: (i) State the relation between hydrogen ion concentration of an aqueous solution and its pH. (ii) An aqueous solution has a pH value of 7.0. Is this solution acidic, basic or neutral? (iii) Which has a higher pH value, 1 M HCI or 1 M NaOH solution? (iv) Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it? (v) How do [H + ] ions exist in water?

  • If H+ ion concentration is more, pH will be less and vice-versa or pH of a solution is inversely proportional to H+ ion concentration or pH 5.2 log (H+).
  • This solution is neutral.
  • 1 M NaOH solution.
  • Tooth decade is due to the bacteria present in the teeth after having food. The bacteria produce acid by degradation of sugar and corrodes the tooth. This can be prevented by brushing teeth with toothpaste at morning and night continuously
  • As hydronium [H3O]+ ion.

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