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Chemistry Form 4 • MODULE

(iv) 1 mol dm of hydrochloric acid / 1 mol dm asid hidroklorik ? P
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–3
(v) 1 mol dm sodium hydroxide solution / 1 mol dm larutan natrium hidroksida ? U
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–3
(vi) 1 mol dm potassium sulphate solution / 1 mol dm larutan kalium sulfat ? S
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(c) (i) State two solutions which react to form neutral solution.
Nyatakan dua larutan yang bertindak balas untuk membentuk larutan neutral.
P/Q/R and T/U // Hydrochloric acid/ethanoic acid with ammonia aqueous/sodium hydroxide solution.
(ii) Which solutions will produce carbon dioxide gas when calcium carbonate powder is added?
Larutan manakah menghasilkan gas karbon dioksida apabila ditambah serbuk kalsium karbonat?
P/Q // Hydrochloric acid/ethanoic acid

3 The molarity of sodium hydroxide solution is 2 mol dm . What is the concentration of the solution in g dm ?
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[RAM: Na = 23, 0 = 16, H = 1]
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Kemolaran larutan natrium hidroksida ialah 2 mol dm . Apakah kepekatan larutan tersebut dalam g dm ?
[JAR: Na = 23, O = 16, H = 1]

Answer / Jawapan : 80 g dm –3

4 Calculate the molarity of the solution obtained when 14 g potassium hydroxide is dissolved in distilled water to make
up 500 cm solution. [RAM: K = 39, H = 1, O = 16]
3
Hitung kemolaran larutan yang diperoleh apabila 14 g kalium hidroksida dilarutkan dalam air suling untuk menyediakan larutan yang
3
berisi padu 500 cm . [JAR: K = 39, H = 1, O = 16]

Answer / Jawapan : 0.5 mol dm –3

5 Calculate the molarity of a solution which is prepared by dissolving 0.5 mol of hydrogen chloride, HCl in distilled water
3
to make up 250 cm solution.
Hitung kemolaran larutan yang disediakan dengan melarutkan 0.5 mol hidrogen klorida, HCl dalam air suling untuk menyediakan larutan
3
yang berisi padu 250 cm .

Answer / Jawapan : 2 mol dm –3

6 How much of sodium hydroxide in gram should be dissolved in water to prepare 500 cm of 0.5 mol dm sodium
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3
hydroxide solution? [RAM: Na = 23, O = 16, H = 1]
Berapakah jisim natrium hidroksida dalam gram yang patut dilarutkan dalam air untuk menyediakan 500 cm larutan natrium hidroksida
3
0.5 mol dm ? [JAR: Na = 23, O = 16, H = 1]
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Answer / Jawapan : 10 g

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3
7 300 cm water is added to 200 cm hydrochloric acid, 1 mol dm . What is the resulting molarity of the solution?
3
3
Jika 300 cm air ditambah kepada 200 cm asid hidroklorik 1 mol dm , apakah kemolaran bagi larutan yang dihasilkan?
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3

Answer / Jawapan : 0.4 mol dm –3

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