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Chemistry Practical Waec 2016 Free Expo Answers


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Wednesday 13th April 2016
CHEMISTRY PRACTICAL ALT. A 9.30AM - 11.30AM
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( NOTE THAT of this
^ MEANS Raise to power
/ means ÷ divide
* means multiplication sign.
+ means plus
= means equal to)
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3)


(3a) The differences in Boiling point of a liquid is
(I) they are used to separate the mixture of color
(II) with close different boiling point

(3b) (i) To make the accurate result of the solution
(II) To avoid the error of decimal


3c)
C1 = 2.5mol/dm3
V2 = 500cm
C2 = 0.2mol/dm3
V1 = ?
C1V1 = C2V2
V1 = C2V2/C1
V1 = 0.2 x 500 / 2.5
V1 = 40.0cm3




2)


2)

I)
TEST A = C + distilled H20

OBSERVATION = Partly soluble colorless filtrate
white residue

INFRENCE = C is mixture of soluble & insoluble
salts


II)
TEST B = Filtrate + AgNo3 , | HNO3 , | excess
NH3

OBSERVATION = White PPT | PPT Insoluble | PPT
dissolve

INFRENCE = Cl^- , SO3^2-, CO3^2- present | Cl- presnt | Cl- confirmed


III)
TEST = Residue + HNO3

OBSERVATION = Effervescence
colorless,odorless gas, turns lime water milky.

INFRENCE = CO2(g) , CO3^2- is present


Iv)
TEST = Filtrate + NaOH in drop

OBSERVATION = White Gelatinous PPT

INFRENCE =


IV)
(ii)
TEST = Filtrate + NaOH in Excess OBSERVATION = PPT dissolve

INFRENCE = Zn2+ , Pb2+ present


IV)
(iii) TEST = Filtrate + NH3 in drop

OBSERVATION = White Gelatinous PPT

INFRENCE =


IV)
(iv) TEST = Filtrate + NH3 in Excess

OBSERVATION = PPT Dissolve

INFRENCE = Zn2+ confirmed




1)




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