Use Your School End Point.

1a)

Volume of pepette = 25.00Cm^2

Indicator Used = Methyl Orange

Tabulate

BURETTE READING|ROUGH|1ST|2ND|3RD|

Final reading Cm^3|25.00|34.00|29.20|24.10|

Initial Reading Cm^3|0.00|10.00|5.00|0.00|

Volume Of Acid Used In Cm^3|25.00|24.00|24.20|

24.10|

Average Volume of Acid used =

(24.00+24.20+24.10/3)cm^3

=24.10cm^3

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2a)
-Observation-
part of the C dissolves,colourless filtrate salt
-Inference-
C is a mixture of soluble salt
2bi)
-observation-
white precipitate formed
-Inference-
Cl is present
2bii)
-Observation-
precipitate dissolves
-Inference-
Cl confirmed
2biii)
-Observation-
colourless gas evolved with characteristic choking smell,
turns litimus paper blue
-Inference-
Gas is NH3
2c)
-Observation-
Residue dissolves liberating a colourless gas which turns
lime water milky
-Inference-
gas is CO2
CO^2-3 present
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3i)

A white precipitate of barium sulphate will be formed by

the instant reaction between barium chloride and

sulphuric acid.

BaCl2 + H2SO4 = BaSO4 + 2HCl

3b)

Iron sulfide reacts with hydrochloric acid, releasing the

malodorous (rotten egg smell) and very toxic

gas,hydrogen sulphide. FeS + 2 HCl → FeCl2+ H2S

3c)

The iron dissolves, releasing hydrogen and making an

iron chloride solution:

Fe + 2HCl → FeCl₂ + H₂