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👑 2020 NECO VERIFIED CHEMISTRY PRACTICAL ANSWERS👑
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(1)
NOTE: PLEASE REMEMBER TO USE YOUR SCHOOL’S AVERAGE TITRE VALUE(AVERAGE VOLUME OF ACID). WE USED 21.47cm3, TRY TO KNOW YOUR SCHOOL’S AVERAGE TITRE VALUE. ASK YOUR CHEMISTRY TEACHER. THEN, ANYWHERE YOU SEE 21.47cm3 IN MY CALCULATION, PUT YOUR SCHOOL’S OWN AND RE-CALCULATE. THIS IS VERY IMPORTANT!!!
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(2ai)
Tabulate:
TEST: C + 5cm³ of distilled water and shake thoroughly. Divide the solutions into three portions.
OBSERVATION: A pale green solution results
INFERENCE: Salt is soluble
(2aii)
TEST: To the first portion add NaOH solution in drys
OBSERVATION: Dark green gelatinous was formed
INFERENCE: Fe²+ present
(2aiii)
TEST: then in excess
OBSERVATION: Precipitate is insoluble
INFERENCE: Fe²+ present
(2aiv)
TEST: To the second portion add K3Fe(CN)6 solution
OBSERVATION: A dark blue precipitate formed
INFERENCE: Fe²+ confirmed
(2bi)
TEST: To the third portion add AgNO³ solution
OBSERVATION: White Precipitate formed
INFERENCE: SO4²- , CL- CO²- present
(2bii)
TEST: To the results obtained in add dilute HNO3 in drops , then excess
OBSERVATION: White Precipitate is insoluble
INFERENCE: CL- present
(2biii)
TEST: To the results obtained in add NH3 solution
OBSERVATION: White Precipitate dissolves
INFERENCE: CL- Confirmed
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(3ai)
Filtration
(3aii)
Diagram
(3bi)
I. Methyl Orange
II. Methyl orange
III. Phenolphthalein
(3bii)
A white precipitate soluble in excess dilute HCl is formed
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How can I get diagram of question 3aii
Aliyu aminu • Oct 21, 2020 • 12:23 PM •