2024 WAEC CHEMISTRY: 2024 WAEC CHEMISTRY PRACTICAL ANSWERS (8187)

Monday 6th May, 2019

Chemistry 3 (Practical) (Alternative A) 09:30 a.m. 11:30 a.m. (1st Set)

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Pls Use Your School End Point

VERY IMPORTANT MESSAGE:
Please make sure you use your school end point in that number 1. In my answer, you will see that i used 12.50cm3. Make sure you use what your school used. So try edit my 12.50cm3 and put yours, then recalculate. Meaning that you should replace my 12.50cm3 with your school's end point anywhere you see it on my work. Some school got 12.90cm3, 13.00cm3, some even got 18.50cm3, etc

MORE EXPLANATION:
You should use ur school average titre value in number 1a bcos each school have their general titre value for their students which should differ a little with their fellow classmates due to errors encountered during titration in the lab. So when you see 12.50cm3, you should check the range ur school got during the titration in the lab, ur chemistry teacher must have taught how to input ur values and he/she must have given you an average titre value. So, use it to edit our solution. Some school got 13.00cm3, 12.90cm3, 15.50cm3, etc. You should edit and recalculate the Number 1bii by editing our 12.50 there with ur school value. But if ur school, got ranges like 12.30cm3-12.70cm3, then u can use my 12.50cm3. Its difference is always +- 0.2... Just take note. This is applicable in number 1a and 1bii.
Thanks

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(1a)
DRAW A TABLE WITH THE FOLLOWING

Burette reading|ROUGH|1st |2nd |3rd 
Final |13.60|15.50|14.80|12.50
Initial |1.00 |3.10 |2.40 |0.00
Vol. acid used |12.60|12.60|12.40|12.50

Volume of S2O3

Welcome to official 2024 Chemistry WAEC answer page. We provide 2024 Chemistry WAEC Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct WAEC Chems Expo