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100% WAEC GCE 2017 Real ( Chemistry Practical ) Answers Available Here..
Author: Mr. Dan
Posted on: 02:02:47 Fri, 15 Sep 2017


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100% WAEC GCE 2017 Real ( chemistry practical ) Answers Available Here..
===========
(1ai)
tabulate:
Burette reading 1cm^3|1|2|3|
final reading|33.10|30.00|25.0O|
initial reading|9.60|7.50|2.40|
volume of acid used 1cm^3|23.50|22.50|22.60|

(1aii)
avaerage volume of acide used= 22.50+22.60/2 =22.55cm^3

(1bi)
5Fe^2+ +Mn0^-4 + 8H^+ ---->5Fe^2+ +Mn^2+ + 4H20
MA=?
MB=0.0200moldm^-3
VB=22.55cm^3
VA=25cn^3
NA=5
NB=1
MAVA/MBVB=NA/NB
MA*25/0.0200*22.55=5/1
MA=0.0200*22.55*5/25
=0.0900moldm^-3

(1bii)
Molar mass of FeSO4' 7H2O
56+32+(4*16)+7(18)
56+32+64+126
=278gmol^-1
Con of FeSO4 7H2O in gdm^-3=0.0900*278=25.02gdm^-3

(1biii)
Mass of =33.60-25.02
FeSO4 7H2O=8.58gdm^-3
%age of FeSO4 7H20=8.58/33.60*100=25.54%

(1ci)
The reason is KMno4 is a very strong oxidizing agent which can oxidise hydrochloric acid

(1cii)
Because of the dark purple color of KMnO4 the bottom of the minisucs in the burette is not clearly seen so the upper of the miniscus is read

(1ciii)
Because the product Mn^2+ formed is colourless
======================

(2a)
TEST|OBSERVATION|INFERENCE

(2ai)
TEST: A+distilled water and stirred
OBSERVATION: A disolved in water
INFERENCE: A is soluble in salt

(2aii)
TEST: A(aq)+litmus paper
OBSERVATION: Turns blue litmus paper red
INFERENCE: A is an acidiic salt

(2aiii)
TEST: A(aq)+NaOH(aq)- in drops, then in excess
OBSERVATION:
-White gelatinous ppt formed.
-Precipitate soluble/dissolved
INFERENCE:
Pb^2+ or Zn^2+ or Al^3+ present
Pb^2+ or Zn^2+ or Al^3+ present

(2aiv)
TEST:
A(aq)+NH3(aq)
- in dropss,
- then in excess
OBSERVATION:
-White gelatinous precipitate
-Precipitate insoluble
INFERENCE:
-Pb^2+ or Zn^2+ or Al^3+
-Al^3+ present

(2av)
TEST:
A(aq)+FeSO4(aq)+conc H2SO4
OBSERVATION:
Brown ring forms between the two solutions
INFERENCE:
NO3- confirmed

(2bi)
A is aluminium trioxonitrate(v)

(2bii)
Al(NO3)3

(2c)
TEST|OBSERVATION|INFERENCE

(2ci)
TEST:
K+NaHCO3(aq)
OBSERVATION:
No visible reaction is observed
INFERENCE:
NaHCO3(aq) does not show result for alkanols(K)

(2cii)
TEST: K+benedict solution+heat
OBSERVATION: There is no change in the colour of the benedicts solution
INFERENCE: Benedicts solution is not an indicator for alkanols(K)

(2ciii)
TEST:
K+KMnO4(aq)
OBSERVATION:
KMnO4(aq) solution changes from purple to colourless
INFERENCE:
Alkanol is being oxidized by KMnO4

(2civ)
TEST: K+CH3COOH+conc H2SO4
OBSERVATION: pleasant fruity smell is observed
INFERENCE: Esterification reaction has occured
================

(3a)
(i) Putsome distilled water in a beaker
(ii) Measure 100cm^3 of 2.00mol/dm^3 of the stock solution by means of a burette and pour all the solution into the beaker containing the distilled water
(iii) Stir the solution
(iv) Transfer the solution into a 250cm^3 volumetric flask by means of a funnel
(v) Ensure that all the solution in the volumetric flask has been transferred by thoroughly rinsing the inside of the beaker with distilled water
(vi) Dilute the solution in the volumetric flask with distilled water until it reaches the 250cm^3 mark
(vii) Shake the solution carefully

(3b)
(i) CH3COONa: It forms basic solution
(ii) Al2(SO4)3: Acidic solution
(iii) KNO3: Neutral solution

(3c)
Acidified potasium tetraoxomanganate(vii) KMnO4 was placed in the burette
=============



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