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Your Favorites site is Here again to give You the Best in Upcoming WAEC, we would Like to Start with Chemistry Practical SPECIMEN Just to Let You know that we would Surely give You the best and This Would be Last WAEC You will Right by the Special grace of God and Our Little Support……
NOTE:- This are Biology Specimen not The Questions, Real Question And Answers Would be Forward to Our Subscriber, So we advice You to Subscribe HERE to Get Full access to Our Real Questions and Answers at least 24hours to Exam time
2013/2014 REAL WAEC CHEMISTRY SPECIMEM
i. Red and Blue Litmus Paper
ii. Aqueous NH3
iii. Dilute HCl
iv. Barium Chloride Solution
vi. Dilute HNO3
vii. AgNO3
vii. Lime Water
APPARATUS.
*Glass rod*Filtration paper
*Spatula
*Two boiling tubes
*Four test tubes
*Methyl Orange Indicator
*Wash Bottle containing
distilled water [H2O]
[-]2.8cm3 of concentrated
H2SO4---An
[-]3?9g of NaOH per dm3 of
solution---Bn
[-]6.6g of (NH4)2SO4 per dm3---
Cn
[-]FeCl3 per dm3
CHEMISTRY PRACTICAL :: WHAT
TO EXPECT.
QUESTION 1 is always on
TITRATION.
Guess by now you should know
how to TABULATE your readings
& AT THE SAME
TIME,MANIPULATE YOUR
READINGS TO GET YOUR END
POINT.
[N.B :: Your teacher will give
you an end point you will work
on.]
PRACTICE HOW TO MANIPULATE
YOUR TABLE.
Remember, this is key.
IF YOUR SCHOOL'S END POINT is
23.30cm^3, YOU SHOULDN'T
EXCEED or - 0.20. i.e IT'S A
THING OF PLUS OR MINUS 0.20.
IF YOUR SCHOOL'S END POINT IS
23.30, IT'S EITHER YOUR
ANSWER IS 21.30, 24.30 or
25.30, 22.30.
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AND PLEASE NOTE
Your Volume of Pipette Used
Should be noted on your
answer sheet.
Indicator Used should also be
noted.
To show how good you are, you
can also decide to tell the
examiner the
SOLUTION IN BURETTE &
also
SOLUTION IN PIPETTE.(BEFORE
THE TABLE)
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DON'T FORGET TO PUT THE
UNITS OF ALL WHAT YOUR HAVE
CALCULATED.
ANY UNIT OMITTED ATTRACTS A
DEDUCTION OF 1/2 (Half mark)
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SO BE CAREFUL.
MAKE REFERENCE TO YOUR PAST
QUESTION BOOKLET FOR MORE.
THAT'S ALL ON TITRATION.
__________________
TEST :: Cn Heat
OBSERVATION :: Gas evolved.
INFERENCE :: NH3 form NH4 salt
present.
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TEST :: Cn HCl BaCl
OBSERVATION :: White
precipitate formed.
*Insoluble in excess dilute HCl
INFERENCE :: SO4^2-, SO3^2-,
CO3^2- suspected.
*SO4^2- present.
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TEST :: Dn NaOH
OBSERVATION :: Reddish Brown
Precipitate formed.
Insoluble in excess.
INFERENCE :: Fe3 present.
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TEST :: Dn aqueous NH3
OBSERVATION :: Reddish Brown
NOTE:-Please Note that this Specimen was Gotten from our Second Source and We have to Confirm it from Our 1st Choice too Buh I am 90% Sure that This is The Real Specimen. If we Later Discover any Changes in Above Specimen we would keep You Informed and Updated …….
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