summary of 2013/2014 waec chemistry practical.

Posted in the Nigeria Forum

Timmy

Europe

#1 Apr 8, 2013
THE SUMMARY OF 2013 CHEMISTRY
PRACTICALS SPECIMEN.
1. VOLUMENTRIC ANALYSIS
QUESTION 1.
'A' is a solution of tetraoxosulphate(vi).
B is a solution coomtaining !.4g of
potassiumb hydroxide per 25.0cm3.
(a.) Put A into burette and titrate with
20.0cm3 or 25.0cm3 portion into of B
Karma:+11/-1
using Methyl Orange as an indicator.
Record the volume of your pipette.
Tabulate your burette readings and
calculate the average volume of acid used.
(b.) From your result and information
provided. Calculate the
(i.) Concentration of B in mol/dm3
(ii.) Concentration of A in mol/dm3
(iii.) Number of Hydrogen ions in 1.0dm^2
of A.
esmonney
MonneyThe equation for the reaction is: H2SO4 +
2KOH --> k2SO4 + 2H2O.
{H=1, O=16, K=39}
Burrete reading(cm3)| Rough | 1st | 2nd |
3rd
Final(cm3)| 18.60 | 18.00| 20.30|
28.00
Initial(cm3)| 0.00 | 0.00 | 2.30 | 10.00
Vol. Acid used(cm3)| 18.60 |18.00 | 18.00|
am
18.00
The average volume of acid used = 18.00 +
18.00 + 18.00/3 = 18.00cm3
(bi.) Mass of KOH per dm3 of B = 39+16+1=
56.
Conc. of B = 5.6/56 = 0.01mol/dm3.
(bii.) The equation for the reaction is:
H2SO4 + 2KOH --> k2SO4 + 2H2O.
From the equation ==> Conc of A *
Volume of A * Mole ratio =
CA*18.00/0.10*2 = 1/2
.'. CA= 0.10 * 25/2*18'
CA= 0.0694mol/dm3.
(biii.) 1dm3 of 1.0mol/dm3 H2SO4 contains
(2*6.0*10^23).
Hydrogen atom ==> 1dm3 of
0.694mol/dm3
H2SO4 contains 2*6.0*10^23 =8.328x10^22.---------
call 08135101082 now and pass all your papre at once.

Since: Apr 13

United States

#2 Apr 8, 2013
nice one but i nd ur help in mathematics
Amina

Lagos, Nigeria

#3 Apr 9, 2013
Thank you jub well do but no three answer will be needed
jimmy

UK

#4 Apr 10, 2013
This question is a direct question from past questions and answers....1996 chemistry 1 practicals......stop deceiving ppl abeg we are not fools
xandi

Satellite Provider

#5 Apr 10, 2013
i wander wat u gain by postin dis.well itz 4 fools dat dont read or go tru past questions 2 confirm
Steve

Europe

#6 Apr 17, 2013
I want to learn more on chemistry
abdul

Ashburn, VA

#7 Apr 17, 2013
we ar nt fools guy
Uzokwelu lilian c

Sweden

#8 Apr 17, 2013
U tnk u cn decieve us rit
Mikolanny

Europe

#9 Apr 17, 2013
Oga i don check am for past que. I don see am 4 1996 chemistry

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