WAEC 2023 - CHEMISTRY PRACTICAL (ALT. B) ANSWER


TEACHER'S REPORT FORM

(2a)
E contains 7.0 cm³ of concentrated HNO3 per dm³

(2b)
F contains 3.2 g of NaOH per dm³ of solution.

(3)
(i) 20.50 cm³
(ii) 20.40 cm³
(iii) 20.30 cm³
Average: 20.40cm³
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TAKE NOTE


For question 1

Use your school's endpoint and use it wherever you see our endpoint (20.4cm³) ...and calculate with it

Replace our 20.4 in 1bii 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 20.40, 20.45, 20.30, etc


ALSO NOTE:
Answer you got while recalculating your 1bii is what you will use in 1biii and 1biv.
If you check our solution, you will see that we got 0.03264, when u use another average titre value (end point), you will not get same, so use what u got and replace our 0.03264 in 1biii and 1biv and re-calculate.
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(1)



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(2)


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(3)