WAEC 2025 CHEMISTRY PRACTICAL ANSWER

Hope u know ur school's average titre value/end point by now?
Make sure you use ur school's end point

In my solution, u might be seeing 26.33cm³, change it to ur school's own. That's what it is marked with*

Any calculation done with 26.33 should also be changed to what u got and re-calculated

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LET ME BREAK IT DOWN WITH OUR SOLUTION

For question 1

Use your school's endpoint and use it wherever you see our endpoint (26.33cm³) ...and calculate with it

Replace our 26.33 in 1bii to your school's endpoint and do the calculation.

What you got in 1bii, should be used to solve 1biii. You can see we got CB as 0.0952 after calculating with our endpoint (0.0952).

Then we used our 0.0952 to calculate in 1biii, so u will change our 0.0952 to what u got as CB in 1bii to calculate.

You can see that we got 8.0 in 1biii. Replace the 8 in 1biv with what u got in 1biii and re-calculate to get your own percentage in 1biv.

Chemistry students will understand better.

Their teachers should guide them too

If your school wants to use mine, then the chemistry teacher must submit endpoint similar to ours without much difference...eg 26.33, 26.10, 26.40, 26.30, 26.20 etc
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(1)


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(2)


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(3a)


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NOTE THAT IF YOUR SCHOOL SUBMITS THIS FORM, IT MEANS YOU SHOULD USE MY ENDPOINT. YOUR TEACHERS CAN REPLACE OUR OWN TITRE VALUES TO YOUR SCHOOL'S OWN DEPENDING ON WHAT YOU USED AS ENDPOINT & TITRE VALUES.

BUT THE 8.6 AND 8.0 IN THE NUMBER 2 OF TEACHERS' REPORT FORM ARE SAME FOR ALL SCHOOLS