asid,bes.k2.struktur(bahagian 1)
TRANSCRIPT
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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.
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1 markah
(ii) *rite a +alance chemical e,uation for the reaction in 6(a)(i). %ulis persamaan kimia $ang seimbang bagi tindak balas dalam 6 &a'&i'.
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2 markah
(iii) tate the colour change of the solution in the conical flas& when the end point of titration
is reached.N$atakan perubahan (arna bagi larutan dalam kelalang kon itu apabila takat akhir
peneutralan dicapai.
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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.
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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!.
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3 markah
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