WAEC GCE Nov/Dec 2018 Chemistry Practical Expo/Runz Answer

Welcome to the Real and Verified WAEC GCE Chemistry Practical Questions and Answer – Nov/Dec 2018 Expo Runz.

2018 Waec gce economics expo
Burette reading |1 |2 |3 |
final reading |24.80|34.50|20.65|
initial reading |0.00 |10.50|6.55 |
vol of acid used|24.80|24.00|24.10|
(1aii) Average volume of A used
Va = 24.00 + 24.10/2
= 24.05cm^3
Concentration of A in moldm^-3
A contains 0.79g of KMnO4 per 250cm³ of solution.
Hence since 250cm³ = 0.79g
100cm³ = Xg
X = 1000×0.79/250 = 3.16g
Hence Conc in g/dm³ of A = 3.16gdm^-³
But molar conc = mass conc(gdm^-³)/molar mass(g/mol)
Hence molar Conc.Of A= 3.16gdm^-3/molar mass ofA
But molar mass of A = KMnO4
= 39 + 55 + 4(16) = 39 + 55 + 64
= 158g/mol
Hence Conc in moldm^-³ of A = 3.16gdm^-3/158g/mol
= 0.020moldm^-3
A is ZnSO4(aq)
B is NaOH(aq)
C is Pb(NO3)2 (aq)
D is HCL(aq)
it is used to distinguish Pb from Zn since both behave alike with NAPth
It gives a white precipitate with Pb^2+ ions but not with Zn^2+. The first
row obviously shows that. Also there actually no visible reaction whne Itcl (A) and NaOlt are mixed(C)
Row 2
 when A and B mirces, the products Zncl2 and
H2SO4 one soluble hence no visible reaction
is scene Between B and D, a white precipitate is seen because PbaS04 insoluble
Between B and C, Zn^2+ On yield a white gelatinous precipate with NaOlta
Question 3
a(i) Sodium is stored under paraffin oil to prevent its oxidation by atmospheric gases
(ii) desiccator lid must be greased with a thin layer of grease, to ensure an airtight seal.
(ii) Dip a rod in aqueous Ammonia and dip in a beaker containing the acids, only HCl produces dense white fumes of ammonium chloride
c(i) Beaker, glass rod, volumetric flask
(ii) A gas which smells like that of burning(SO2) matches evolves
A is ZnSO4(aq)
B is NaOH(aq)
C is Pb(NO3)2 (aq)
D is HCL(aq)


READ:  WAEC GCE Expo 2019 | Answers all subjects - Biology, Physics, Chemistry jan/feb



Expobaze.com posts all exam expo answer earlier than others



WAEC GCE ssce 2018 Chemistry Practical expo answers, Ssce 2018 Chemistry Practical Practical Expo answers now available, nov/dec Chemistry Practical theory Answers for 2018, Chemistry Practical Practical Questions WAEC GCE Ssce Expo Answers Here, Free wassce Chemistry Practical objective, essay & theory correct Expo 2018 answers Runz WAEC GCE Chemistry Practical, WAEC GCE Ssce 2018 Free Chemistry Practical essay, Practical Questions and Answers Expo for WAEC GCE Chemistry Practical Paper 1 and Paper 2 Practical Questions and Answers Expo Now Posted, Free Chemistry Practical objective ans for internal ssce, see WAEC GCE ssce expo Chemistry Practical Practical, essay questions for free, loadedexpo correct wassce Economics ans, sure WAEC GCE ssce Chemistry Practical objective answers runz runs expo free real and correct WAEC GCE ssce 2018 nov/dec Chemistry Practical free expo runz runs ans answers online for free see free answers online, 2018 Verified WAEC GCE Free Ssce Chemistry Practical Practical Answers have been posted

READ:  2019 WAEC GCE EXPO: Free 2019/2020 Waec Gce Answers All Subjects Runz Jan/Feb

Related Posts

Be the first to comment

Leave a Reply

Your email address will not be published.