VITAL INFORMATION
For question 1
Use your school’s endpoint and use it wherever you see our endpoint (18.13cm³) …and calculate with it
Replace our 18.13 in 1bi and do the calculation.
If your school wants to use mine, then the chemistry teacher must submit endpoint similar to ours without much difference…eg 18.13, 18.10, 17.90, 18.20, 18.30 etc
USE THIS NO.1….1b CORRECTED
(1a)
TABULATE PLEASE
Burette | Rough| 1st | 2nd
Final reading(cm³) | 19.00 | 18.10| 18.10|
Initial reading(cm³) | 0.00| 0.00| 0.00
Volume of A used(cm³) | 19.00| 18.10| 18.10|
Average titre = 18.10+18.10/2
= 18.10cm³
(1bi)
Conc. of B in mol/dm³ = ??
Ca = 0.020mol/dm³, Va = 18.10cm³
Na= 1, Nb = 5, Vb= 25.00cm³ , Cb= ??
CaVa/CbVb= Na/Nb
Cb = CaVaNa/VbNb
Cb= (0.020*18.10*5)/(25.0*1)
Cb= 0.0724mol/dm³
(1bii)
Con. of B in g/dm³ = ??
Con.(g/dm³) = Mass*1000/volume
= 3.8*1000/250
= 15.2g/dm³
(1biii)
FeSO₄<—> Fe²⁺ + SO₄²⁻
1 mol of FeSO₄ 1mol Fe²⁺
0.0724mol/dm³ xmol/dm Fe²⁺
x= 1*0.0724 = 0.0724mol/dm³
Mole= Con.*Vol/1000
Mole = 0.0724*250/1000
Mole= 0.0181mol
Mass= mole * m.m
= 0.0181*56
= 1.0136g
(1biv)
Percentage= 1.0136*100/15.2
= 6.67%
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(2)
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(3a
(i) Oxygen (O₂)
(ii) Carbon dioxide (CO₂)
(3b)
(i) Pipette
(ii) Burette
(3c)
A fume-cupboard is used to provide a safe enclosure for experiments that involve hazardous or toxic fumes, allowing for ventilation and protection of the experimenter and others in the lab.
(3d)
(i) Lab coats
(ii) Gloves
(iii) Goggles (or safety glasses)
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