asid,bes.k2.struktur(bahagian 1)

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  • 8/17/2019 Asid,Bes.K2.Struktur(Bahagian 1)

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    6 (a) Diagram 6 shows the apparatus set-up for the titration of 25.0 cm3 of 0.1 mol dm-3 sodiumhydroide! "a#$ solution with dilute hydrochloric acid! $%l using phenolphthalein as an

    indicator.Rajah 6 menunjukkan susunan radas bagi peneutralan antara 25.0 cm 3  larutan natrium

    hidroksida, NaOH 0. mol dm!3 dengan asid hidroklorik cair, H"l menggunakan #enol#taleinsebagai penunjuk.

    Diagram 6Rajah 6 

      (i) "ame of the type of reaction that occurs in the conical flas&.  Namakan jenis tindak balas $ang berlaku dalam kelalang kon itu.

     ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''  1 mark 

    1 markah

      (ii) *rite a +alance chemical e,uation for the reaction in 6(a)(i).  %ulis persamaan kimia $ang seimbang bagi tindak balas dalam 6 &a'&i'.

      '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 2 marks

    2 markah

      (iii) tate the colour change of the solution in the conical flas& when the end point of titration

      is reached.N$atakan perubahan (arna bagi larutan dalam kelalang kon itu apabila takat akhir

     peneutralan dicapai.

     ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 1 mark 

    Dilute hydrochloric acid )sid hidroklorik cair 

    25.0 cm3 sodiumhydroide solution /henolphthalein25.0 cm3 larutan natriumhidroksida * #enol#talein

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    1 markah  (i) 20.0 cm3 of hydrochloric acid is needed to neutralie completely the sodium hydroide

    solution in the conical flas&.%alculate the molarity of the hydrochloric acid.20.0 cm3 asid hidroklorik diperlukan untuk meneutralkan dengan lengkap larutan natriumhidroksida dalam kelalang kon itu.Hitung kemolaran asid hidroklorik itu.

    2 marks2 markah

      (+) a+le 6 shows the concentration and olume of two different types of strong acid! and 4!which are used to neutralie 20.0 cm3 of 0.5 mol dm-3 potassium hydroide solution.+adual 6 menunjukkan kepekatan dan isi padu dua jenis asid kuat $ang berlainan, dan 4,$ang digunakan untuk meneutralkan 20.0 cm3 larutan kalium hidroksida 0.5 mol dm!3.

     cid   )sid 

    4

      %oncentrationepekatan

    0.5 mol dm-3 0.5 mol dm-3

      olume

      -si padu

    cm3 2 cm3

      7ased on the information in a+le 6! identify acid and acid 4.  erdasarkan maklumat dalam +adual 6, kenal pasti asid  dan asid  4.

    8 '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 

      48 '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 2 marks

    2 markah  (c) ulphuric acid solution contains sulphate ion! #9

    2-.Descri+e one confirmatory test for sulphate ion! #9

    2-.

      /arutan asid sul#uric mengandungi ion sul#at, O12!

    .Huraikan satu  ujian pengesahan bagi ion sul#at, O1

    2!.

     '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''  

     ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 

      ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 3 marks

    3 markah

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