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   DIR Return to: WAEC/NECO 2016/2017 UPDATE
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       #Post#: 24--------------------------------------------------
       2016/2017 WAEC VERIFIED CHEMISTRY PRACTICAL ANSWERS
   DIR By: anephy
       Date: April 12, 2016, 11:08 am
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       .
       ( NOTE THAT of this
       ^ MEANS Raise to power
       / means ÷ divide
       * means multiplication sign.
       + means plus
       = means equal to)
       ============
       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
       (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=2.5moldm³
       V2=500cm³
       Ç2=0.2moldm³
       V1=?
       C1V1=C2V2
       V1=C2V2/C1
       V1=0.2*500/2.5
       V1=40.0cm³
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