CHEMISTRY PRACTICAL
These are WHAT YOUR SCHOOL MUST
PROVIDE ::
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 YOUREND
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 POINTis
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 POINTIS
23.30, IT'S EITHER YOUR ANSWER
IS 21.30, 24.30 or 25.30, 22.30.
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).....DON'T FORGET TO PUT THE UNITS
OF ALL WHAT YOUR HAVE
CALCULATED.
ANY UNIT OMITTED ATTRACTS A
DEDUCTION OF 1/2 (Half mark)
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.
TEST :: Cn HCl BaCl
OBSERVATION :: White
precipitate formed.
*Insoluble in excess dilute HCl
INFERENCE :: SO4^2-, SO3^2-,
CO3^2- suspected.
*SO4^2- present.
TEST :: Dn NaOH
OBSERVATION :: Reddish Brown
Precipitate formed.
Insoluble in excess.
INFERENCE :: Fe3 present.
TEST :: Dn aqueous NH3
OBSERVATION :: Reddish Brown
Precipitate.
Insoluble in excess.
INFERENCE :: Fe3 present.
TEST :: Dn dilute HCl
OBSERVATION :: Yellowish
precipitate formed.
Insoluble in excess.
INFERENCE :: Fe3 present.
TEST :: Dn dilute HNO3 AgNO3
* aqueous NH3
OBSERVATION :: White
precipitate formed.
* It will dissolve.
INFERENCE :: Cl- present.
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