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_Instructions: Answer Questions One (1)and other (3) Three Questions Making 4 Questions in total to be answered by you_
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THEORY!
(1)
2HCL + Na2CO3 –––> 2Nacl + CO2 + H2O
TABULATE
Final burette Reading (cm³) | Rough 24.00 | First 22.50 | Second 23.00 | Third 23.10
initial Burette Reading (cm³) | Rough 0.00 | First 0.00 | Second 0.00 | Third 0.00 |Â
Volume of Acid used (cm³) | Rough 24.00 | First 22.50 | Second 23.00 | Third 23.10
*NOTE: ENSURE YOU USE YOUR SCHOOL TITRE VALUE AND VOLUME OF ACID USED*
(1ai)
25cm³
(1aii)
Methyl Orange
(1bi)
b=22.50-0.00
b=22.50cm³
a=23.00 – 23.00
a=0
c=23.10 – 0.00
c=23.10cm³
(1bii)
Average Titre Value = 2nd Titre Value + 3rd Titre Value ÷ 2
= 23.00 + 23.10 ÷ 2
= 23.05cm³
Therefore, Average Titre Value, VA = 23.05cm³
CA=?, CB=?, VA=23.05cm³, VB=25cm³
Mass of A = 3g/dm³
Molar Mass Of A = H + Cl = 1 + 35.5
Molar Mass of A = 36.5g/Mol
Molar Concentration = Mass Concentration ÷ Molar Mass
= 3 ÷ 36.5
= 0.0822mol/dm³
:. CA = 0.0822mol/dm³
(1biii)
CAVA/CBVB = nA/nB
Where nA = 2 , nB = 1, CB =?, CA = 0.0822mol/dm³ , VB = 25
===> 0.0822 × 23.05 ÷ CB × 25 = 2/1
CB = 0.0822 × 23.05 ÷ 2 × 25
CB = 1.8947 ÷ 50
CB = 0.0379Mol/dm³
(1ci)
(i) Beaker
(ii) Separating funnel
(iii) Conical Flask
(iv) Pipette
(v) Burette
(i) Beaker:- This is used to hold liquids in the laboratory for liquidÂ
(ii) Separating funnel:- This is used in the laboratory for Liquid Extractions, It is Precisely used to separate a mixture of two solvents of different densities.
(iii) Conical Flask:- This is used for holding And Measuring Chemical Liquid Samples.
(iv) Pipette:- This is used to measure out Or transfer Small Quantities of liquids.
(v) Burette:- This is used during quantitative analysis to measure the volume of a given liquid or gas.
(1cii)
(Pick Any five)
(i) Obey safety Rules
(ii) Dress Properly
(iii) Handle Corrosive chemicals with extreme care
(iv) Do not mix chemical carelessly
(v) Seek the guidance of the lab attendant if you are in doubt of any mixture you want to carry out
(vi) Do not taste or sniff Chemicals
(vii) Identify Safety Equipment
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(2ai)
Basicity of an acid is defined as the number of replaceable hydrogen atom of the same acid by a base
Graham’s law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of its vapour density.
(3aii)
Check the diagram
(3ci)
(i)Covalent bond.
(ii)Dative or Co-ordinate covalent bond.
(3cii)
-(Choose any 3)-
(i)They have high melting point or boiling point.
(ii)They conduct electricity when molten or in solution.
(iii)They exist as aggregates of ions.
(iv)They are soluble in polar solvent e.g water and insoluble in non-polar solvents.
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(5ai)
Definition of water pollution. Water pollution is the release or injection of substances into the water bodies in quantities or level that are harmful to man, animals and plants.
(5aii)
(Pick any four)
(i) Domestic waste/sewage/household waste.
(ii) Industrial waste/dyes/detergents/lead/mercury compounds.
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