NECO GCE 2017 Chemistry Practical Solution Answer – Nov/Dec Expo

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(1ai) 

Methyl Orange

Reason - Titration of strong acid against base


(1aii) 

Yellow


(1aiii)

Hydrochloric acid


(1aiv)2HCL(aq)+ x2Co3 -> 2 x CL(aq) + H20(aq) + CO2(g)


(1bi) Molar mass of HcL = 1+35.5

=36.5gmol^-1

Con of A is moldm^-3 =

Con of A of gdm^3/molar mass in gdm^3

=7.30gdm^-3/36.5gmol^-1

=0.200moldm^-3


(1bii)


(1biii)

Conc. of B in gdm-3/Conc. of B in moldm-3

=10.6gdm-3/0.148 gdm-3

=101.15g

=101gmol-1


====================

(2ai)

INFERENCE: Sample X is a soluble salt


(2aii)

OBSERVATION: A gas is evolved. The gas turns red moist litmus blue. 

It forms white fumed when NaOH solution was added was added

INFERENCE: Alkaline gas


(2aiii)

INFERENCE: CO3 gas is CO3^2-


(2aiv)

INFERENCE: The solution is alkaline

==============



(3a)

-NH4Cl and AgNo3

-ZnCo3

-FeS

-AgNO3

-NH4Cl


(3b)

-Burrette

-Retort stand

-Solution/Acid

-Conical flask



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