Chemistry (Practical) (Alternative B) answers for the WAEC May/June Exam is read. Here is verified WAEC Chemistry Questions 2025 Verified Answers, here is the solution you are looking for that will help you get good result. The West African Examinations Council (WAEC) is a regional examination body that conducts standardized tests for English-speaking West African countries.
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On Thursday, May 16, 2024, Chemistry 3 (Practical) (Alternative B) will be held in two sets: from 9:30 am to 11:30 am for the first set, and from 12:00 noon to 2:00 pm for the second set.
Also Read: WAEC Chemistry Practical Specimens
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Is WAEC Chemistry Practical Questions 2025 Answers Out?
Yes, the WAEC 2025 expo on Chemistry Practical Questions 2025 answers are out. The West African Examinations Council has released both the questions and answers for the practical scheduled for Thursday, May 16, 2024. You can access all the updated answers for free.
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WAEC Chemistry Practical Answers
(3a)
(i)The salt solution was acidic in nature, as it reacted with sodium trioxocarbonate(IV) (sodium carbonate) to produce effervescence and a white precipitate.
(ii)The salt solution contained a calcium or magnesium ion, as these ions form a white precipitate with sodium carbonate.
(iii)The reaction was exothermic, as the test tube became warm, indicating the release of heat energy.
(3b)
(i) PbSO4 (lead(II) sulfate) would not readily dissolve in water, as it is insoluble in water.
(ii) NaHCO3 (sodium hydrogen carbonate) produces effervescence with dilute mineral acids, as it reacts with acids to produce carbon dioxide gas.
(iii) NH4Cl (ammonium chloride) decomposes on heating, as it breaks down into ammonia and hydrogen chloride gases.
(iv) NaHCO3 (sodium hydrogen carbonate) dissolves in water to form an alkaline solution, as it is a basic salt.
(v) NH4Cl (ammonium chloride) sublimes on heating, as it changes directly from a solid to a gas without going through the liquid phase.
(3c)
(i)Wear protective gear: Wear laboratory goggles, gloves, and a lab coat to protect yourself from skin and eye irritation and splashes.
(ii)Handle chemicals with care: Handle the acid and sodium hydroxide solutions with care, as they can cause skin and eye irritation. Make sure to label the solutions correctly and store them in appropriate locations.
(iii)Use the correct volume of indicator: Add the correct volume of methyl orange indicator to the acid solution, as excess indicator can affect the accuracy of the titration results.
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2025 Chemistry Specimens
(a) 150cm3 of potassium tetraoxomanganate (VII) solution in a corked flask or bottle labeled ‘An’. These should all be the same containing 1.58g dm3 of KMnO4 solution.
(i) dilute sodium hydroxide solution
(ii) dilute hydrochloric acid
(iii) dilute trioxonitrate(v) acid
(iv) silver trioxonitrate(v) solution
(v) aqueous barium chloride
(vi) aqueous ammonia
(vii) lime water
(viii) red and blue litmus paper
(ix) dilute tetraoxosulphate(vi) acid
Guidelines for Passing WAEC Chemistry Examination
When accessing the WAEC (Alternative A) Chemistry Practical Answers for the May/June exam, it’s important to use them responsibly. Here are some guidelines for utilizing the answers effectively:
- Use the answers as a learning tool to understand the expected format and depth of responses.
- Compare your initial answers with the provided solutions to identify any discrepancies and areas for improvement.
- Seek clarification on any concepts or procedures that may be unclear after reviewing the answers.
- Avoid memorizing the answers but focus on understanding the underlying principles and concepts.
- Use the answers to enhance your practical skills and approach to similar experimental tasks.
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