A2 Chemistry: 9701/42 may/june 2020 paper Complete solution

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Комментарии • 5

  • @Elpsycongroo1130
    @Elpsycongroo1130 2 месяца назад +1

    3:08:47 is in our syllabus ?

    • @dark-jq4vi
      @dark-jq4vi Месяц назад

      they removed everything related to dna

  • @uzma28850
    @uzma28850 2 месяца назад

    2) Barium hydroxide is used as a reagent for checking the concentrations of organic acids, due to its lack of carbonate impurities.
    A student weighs out 3.50 g of barium hydroxide and dissolves it in
    500 cm3 of distilled water.
    The ionic product of water, Km = [H+][OH-] = 1×10-14
    2.4) A 200 cm° sample of the barium hydroxide solution was added to
    250 cm? of 0.1 mol dm3 hydrochloric acid.
    Calculate the pH of the final solution.
    Could you please tell how you would answer this? (Qs 2.4)