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F4 chemistry acids and alkalis
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3. (a) Fe^2+(aq) ion will form dark brown iron(II) hydroxide precipitate. Cu^2+(aq) ion will form blue copper(II) hydroxide precipitate. (b) Mg^2+(aq) ion Mg^2+(aq) + 2OH^-(aq) → Mg(OH)2(s) (c) hydroxide ion, OH^- ion (d) Ammonia solution is used as window cleaner. ***** 4. (a) Add solid calcium hydroxide into distilled water until no more soliddissolves. Filter the mixture, and thefiltrate obtained is limewater. (b) hydroxide ion (c) Ca(OH)2 + 2NH4NO3 → Ca(NO3)2 + 2NH3 + 2H2O (d) (i) A white precipitate is formed. Ca^2+(aq) + CO3^2-(aq) → CaCO3(aq) d (ii) A blue precipitate is formed. Cu^2+(aq) + 2OH^-(aq) → Cu(OH)2(aq)
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F4 chemistry acids and alkalis
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Please help me to answer the following questions in English.The best answer is going to obtain 10 points.3. A few drops of ammonia solution are added separately to the following metal ion solutions. K+(aq), Mg2+(aq), Fe2+(aq), Cu2+(aq) ( a ) Which metal ion(s) will form coloured precipitate(s) ? Name ... 顯示更多 Please help me to answer the following questions in English. The best answer is going to obtain 10 points. 3. A few drops of ammonia solution are added separately to the following metal ion solutions. K+(aq), Mg2+(aq), Fe2+(aq), Cu2+(aq) ( a ) Which metal ion(s) will form coloured precipitate(s) ? Name and state the colour of the precipitate(s). ( b ) Which metal ion(s) will form white precipitate(s) ? Write equation(s) for the formation of the white precipitate(s). ( c ) What ion in ammonia solution is responsible for the formation of the white and coloured precipitates ? ( d ) Suggest a common use of ammonia in daily life. 4. Limewater is a saturated aqueous solution of calcium hydroxide. It is an alkaline solution which can be used as a medicine to cure stomach upset in babies. ( a ) Suggest how limewater is prepared in the laboratory form solid calcium hydroxide. ( b ) Name the ion which is responsible for the alkaline properties of lime water. ( c ) When limewater is warmed with ammonium nitrate, a salt, ammonia gas and water are formed. Write an equation for the reaction involved. ( d ) What would be observed when the following dilute aqueous solution is mixed with limewater ? Write an ionic equation for the reaction involved. ( i ) sodium carbonate ( ii ) copper(II) nitrate最佳解答:
3. (a) Fe^2+(aq) ion will form dark brown iron(II) hydroxide precipitate. Cu^2+(aq) ion will form blue copper(II) hydroxide precipitate. (b) Mg^2+(aq) ion Mg^2+(aq) + 2OH^-(aq) → Mg(OH)2(s) (c) hydroxide ion, OH^- ion (d) Ammonia solution is used as window cleaner. ***** 4. (a) Add solid calcium hydroxide into distilled water until no more soliddissolves. Filter the mixture, and thefiltrate obtained is limewater. (b) hydroxide ion (c) Ca(OH)2 + 2NH4NO3 → Ca(NO3)2 + 2NH3 + 2H2O (d) (i) A white precipitate is formed. Ca^2+(aq) + CO3^2-(aq) → CaCO3(aq) d (ii) A blue precipitate is formed. Cu^2+(aq) + 2OH^-(aq) → Cu(OH)2(aq)
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