Page 17 - MODUL KIMIA A+XPLOSIVE SPM (LATEST)

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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) RED ZONE [RZ]

19 Ascorbic acid is a weak acid because it
Asid askorbik adalah asid lemah kerana asid ini
A Has a high melting point.
Mempunyai takat lebur yang tinggi
B is only partially ionized in water.
Hanya mengion separa dalam air
C Contains few hydrogen atoms.
Mengandungi sedikit atom-atom hidrogen
D is only slightly soluble in water
Larut sedikit dalam air

20 Which of the following solutions has the highest concentration of hydroxide ions?
Antara yang berikut, larutan yang manakah mempunyai kepekatan ion hidroksida yang
paling tinggi?

-3
3
A 100 cm of 0.5 mol dm sodium hydroxide, NaOH
-3
3
100 cm 0.5 mol dm natrium hidroksida, NaOH
3
-3
B 100 cm of 0.5 mol dm ammonia solution, NH 3
3 -3
100 cm 0.5 mol dm larutan ammonia, NH 3
-3
3
C 100 cm of 0.5 mol dm hydrochloric acid, HCl
3
-3
100 cm 0.5 mol dm asid hidroklorik, HCl
-3
3
D 100 cm of 0.5 mol dm ethanoic acid, CH 3COOH
3
-3
100 cm 0.5 mol dm asid etanoik, CH 3COOH

21 Diagram 5 shows the set-up of apparatus to investigate the role of water for an acid to
show its acidic properties.
Rajah 5 menunjukkan susunan radas untuk mengkaji peranan air dalam asid untuk
menunjukkan ciri keasidannya.

Set A Set B

Dry hydrogen chloride gas Dry hydrogen chloride gas

Tetrachloromethane Water
Tetraklorometana Air

Diagram 5 / Rajah 5

Dry hydrogen chloride gas is bubbled into both tetrachloromethane and water for 10
minutes and then tested with a piece of blue litmus paper. What are the observations for
Set A and Set B?

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