Neco Chemistry practical answers 2022

Neco Chemistry practical answers 2022

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CHEMISTRY- PRACTICAL-ANSWERS

(1)

Tabulate

Titration; | rough | 1 | 2 | 3 |

 

Final; | 20.50 | 14.00 |14.00 | 14.00 |

 

Initial; | 0.00 | 0.00 | 0.00 | 0.00 |

 

Volume of A used; | 20.50 | 14.00 |14.00 | 14.00 |

 

Volume of pipette used

=25.00cm³

 

(1a)

Average volume of A used = 14.00+14.00+14.00/3

=14.00cm³ (Va)

 

2HNO³ + X²CO³ —> 2XNO³ + H²O + CO²

 

(1bi)

Conc – of B in molldm³ = ?

Given;

Ca= 0.15molldm³

Vb= 25.00cm³

Va= 14.00cm³

Cb= ??

Na= 2

Nb= 1

 

Using;

CaVa/CbVb=Na/Nb

Cb= CaVaNb/VbNa

Cb= 0.15*14.00*1/25.00*2

Cb= 2.1/50

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Cb= 0.042molldm³.

 

(1bii)

Molar mass of B =?

Using;

Conc(molldm³)= Conc(gldm³)/molar mass

0.042/1 * 4.20/m.m

m.m=4.20/0.042

m.m=100glmol

 

(1biii)

Value of x in x²(i)³=?

(2x)+12 + (16*3)= 100

2x+12+48=100

2x+60=100

2x=100-60=40

2x/2=40/2

x=20g/mol

 

(1ci)

(i)I ensure that the readings are taken at the lower meniscus

(ii)I ensure that my saliva did not enter the pipette while taking the base

 

(1cii)

Pink

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(2)

Tabulate

 

(2ai)

Under Observation;

An effervescence occurs in which a colorless and odourless gas which burns blue litmus red is evolved.

 

Under Inference;

CO² gas from CO3^²is suspected

 

(2aii)

Under Observation;

The gas turns lime water milky.

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Under Inference;

CO² gas is confirmed.

 

(2b)

Under Observation;

Y dissolves completely in water

 

Under Inference;

Soluble salt

 

(2bi)

Under Observation;

White gelatinous PPT is formed.

 

Under Inference;

Al³+, Zn²+, Pb²+, present

 

(2bii)

Under Observation;

The white gelatinous PPT dissolve in excess NaOH

 

Under Inference;

Al³+, Zn²+, Pb²+, present

 

(2biii)

Under Observation;

White gelatinous PPT formed.

 

Under Inference;

Al³+, Zn²+, Pb²+, present

 

(2biv)

Under Observation;

The white gelatinous PPT remain insoluble in excess NH³

 

Under Inference;

Al³+, Pb²+, present.

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(3ai)

It increases the boiling point of water

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(3aii)

It requires heat to occur.

 

(3bi)

This is because it is deliquescent.

 

(3bii)

I. Calcium oxide

II. Anhydrous copper(ii) tetraoxosulphate(vi)

 

(3ci)

Hydrogen Chloride

 

(3cii)

I. To separate a mixture of immiscible liquids

II. To collect gases.

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