GUIDE TO NECO 2024 (Salt Analysis) QUALITATIVE ANALYSIS OF Zinc (II) Chloride and Milk Solution

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[@ChemEasy_Eko]

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[@ChemEasy_Eko]

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[@ChemEasy_Eko]

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[@ChemEasy_Eko]

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[@ChemEasy_Eko]

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[@blessingokoro6616]

ChemEazy please I am still waiting for the procedure for sodalime solution 🙏

[@CelineStitches-ch1dj]

Thank you very much sir This is very simple

[@ChemEasy_Eko]

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[@edwinagbeze8232]

Thank u sir, but I think the question pattern is for WAEC

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[@edwinagbeze8232]

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[@ChemEasy_Eko]

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[@genesisdavid-ot5lk]

Boss please can you assist me in the qualitative analysis between CUSO4 AND Zn(No3)2

[@ChemEasy_Eko]

For the QUALITATIVE analysis of CuSO4 and Zn(NO3)2, the ions present are 1. Cu²+ (Copper ion) 2. Zn²+ (Zinc Ion) 3. SO4²- (Sulphate ion) 4. NO3- (Nitrate ion) 1. To Qualitatively analyze copper, the reagents used are caustic soda (NaOH) and aqueous ammonia. PROCEDURE: Dissolve a small amount of copper sulfate in water. OBSERVATION: The solution will be blue, indicating the presence of Cu²⁺ ions. I. Addition of Sodium Hydroxide (NaOH):Procedure: Add a few drops of sodium hydroxide solution to the copper sulfate solution. Observation: A light blue gelatinous precipitate of copper(II) hydroxide (Cu(OH)₂) forms which is insoluble in excess Reaction: Cu²⁺ + 2OH⁻ → Cu(OH)₂ (blue precipitate) II. Addition of Ammonia (NH₃): Procedure: Add dilute ammonia solution to the copper sulfate solution dropwise. Observation: Initially, a light blue precipitate of copper(II) hydroxide forms, which dissolves upon adding excess ammonia, forming a deep blue complex [Cu(NH₃)₄]²⁺. Reaction: Cu(OH)₂ + 4NH₃ → [Cu(NH₃)₄]²⁺ + 2OH⁻ 2. To Qualitatively analyze zinc ion, the reagents used are caustic soda (NaOH) and aqueous ammonia. I. Adding caustic soda in drops give a white gelatinous precipitate, in excess the precipitate is soluble to give a clear solution II. Adding ammonia in drops give a white gelatinous precipitate which is soluble is excess to give a clear solution. 3. To Qualitatively analyze sulphate ion (SO42-), the reagents used are Barium Chloride and dilute HCl I. Make an aqueous solution of the sample. To the solution add barium Chloride, a white precipitate of barium sulphate is form II. Proceed by adding HCl, the precipitate is insoluble in dilute HCl 4. To Qualitatively analyze NO3- the reagents used are freshly prepared FeSO4 solution and concentrated H2SO4. I. Make an aqueous solution of the sample. To the solution of the sample, add few drops of freshly prepared FeSO4 solution followed by concentrated H2SO4 acid along the side of the rest tube in a slant position. A brown ring is formed just at the junction of the acid and the solution. 5. Also, you can test for nitrogen (IV) oxide gas (NO2) by placing Zn(NO3)2 salt in a boiling tube and heat strongly Observation: the salt decomposes with a crackling sound , the gas evolved is reddish brown that turns moist blue litmus paper red. Confirmatory Test with Copper Turnings and Concentrated Sulfuric Acid: Procedure: Add a few copper turnings to the zinc nitrate solution and then add concentrated sulfuric acid. Observation: Brown fumes of nitrogen dioxide (NO₂) will be released, indicating the presence of nitrate ions

[@SolomonAyodele-ro7dv]

Please i dont gave pure copper sulphate can i use the hydrated one

[@ChemEasy_Eko]

Yes you can

[@blessingokoro6616]

Please how do I make sodalime solution🙏, I think it's one of the requirements for the practical, how many grams of Ca(OH)2 and NaOH if I am using 100cm of water

[@ChemEasy_Eko]

I don't see it's relevance in this analysis as it tis used in absorbing CO2 gases, drying gases and sometimes in water purification. Anyway, if you still need the requirements I will send you a detailed procedure for it.

[@blessingokoro6616]

@@ChemEasy_Eko thank you so much, please I really need it, I will appreciate if you will send me the procedure for it.

[@AbughSamsonHough]

NaOH + CaO= soda lime ..that's all

[@blessingokoro6616]

@@AbughSamsonHough how many grams for each

[@blessingokoro6616]

In 250cm3 of water