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5070 s10 ir 31.pdf


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© UCLES 2010

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dilute sulfuric acid
dilute hydrochloric acid
dilute nitric acid

[H]
[H]
[C]

0.5 mol/dm3 sulfuric acid
1.0 mol/dm3 hydrochloric acid
1.0 mol/dm3 nitric acid

identity
silver nitrate
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0.2 mol/dm barium chloride
0.05 mol/dm3

0.2 mol/dm3 barium nitrate [H] (labelled barium chloride) may
be used as an alternative.

notes

5070/31/CI/M/J/10

[T] [N]

[H]

hazard

acidified aqueous potassium
dichromate(VI)

limewater

label

Dissolve 14.8 g of K2Cr2O7 [T] [N] in 50 cm3 of 1 mol/dm3 sulfuric
acid [H]. Make the solution up to 1 dm3 with distilled water.
The use of plastic gloves may be considered to prevent contact
with skin.

0.05 mol/dm3 K2Cr2O7
0.05 mol/dm3 H2SO4

the apparatus normally used in the
Centre for use with limewater in testing
for carbon dioxide

wooden splints

plain filter strips for use with aqueous
potassium dichromate(VI)

red and blue litmus paper or universal
indicator paper

Prepare fresh limewater by leaving distilled water to stand
over solid calcium hydroxide [H] for several days, shaking
occasionally. Decant or filter the solution.

notes

saturated aqueous calcium hydroxide,
Ca(OH)2

identity

The reagents, materials and apparatus to test the gases listed in the syllabus must be available to candidates. If necessary, they may be made
available from a communal supply: however, the attention of the Invigilators should be drawn to the fact that such an arrangement may enhance the
opportunity for malpractice between candidates.

label
aqueous silver nitrate
aqueous barium chloride

hazard
[H] [N]
[H]

The standard bench reagents specifically required are set out below. If necessary, they may be made available from a communal supply: however,
the attention of the Invigilators should be drawn to the fact that such an arrangement may enhance the opportunity for malpractice between
candidates.

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