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nerdy chatters On Friday, September 16, 2011 at 7:38 AM 1 comments ♥ 
(i) Name the salt and the base.
(ii) Describe the observations for the reaction.
(iii) Write a chemical equation for the reaction (include state symbols).
(iv) Write an ionic equation for the reaction.
i) salt , ammonium nitrate , NH4NO3
base , zinc hydroxide , ZnOH
ii)white precipitate is produced .
iii)Zn(NO3)2 [aq] + 2NH4OH [aq] → 2NH4NO3 [aq] + Zn(OH)2 [s]
iv)Zn2+ [aq] + 2OH- [aq] → Zn(OH)2 [s]
Q2 Ammonium sulfate is heated with sodium hydroxide.
(i) Write a chemical equation (include state symbols) for the reaction.
(ii) Describe a test for the gas.
i) (NH4)2SO4 [aq] + 2NaOH [aq] → Na2SO4 [aq] + 2NH3 [g] + 2H2O [l]Q3 An unknown green solution is heated with a piece of aluminium foil and sodium hydroxide solution.
(i) The gas produced turns damp red litmus paper blue. Name the gas evolved.
(ii) This is a confirmatory test for an anion. Name this anion.
(iii) Give a possible cation which gives the green solution.
i)ammonia gas
ii) nitrate ion
iii) iron(II) ions
Q4 Sulfuric acid is titrated with potassium hydroxide in the preparation of potassium sulfate salt.
(i) Explain why this method is recommended for the preparation for this salt.
(ii) Write an ionic equation for the reaction.
i) they are soluble and colourless , titration method with an indicator can determine the end point of the neutralization between the acid and the alkaline . and group I salt is produced
Q2 Ammonium sulfate is heated with sodium hydroxide.
(i) Write a chemical equation (include state symbols) for the reaction.
(ii) Describe a test for the gas.
i) (NH4)2SO4 [aq] + 2NaOH [aq] → Na2SO4 [aq] + 2NH3 [g] + 2H2O [l]Q3 An unknown green solution is heated with a piece of aluminium foil and sodium hydroxide solution.
(i) The gas produced turns damp red litmus paper blue. Name the gas evolved.
(ii) This is a confirmatory test for an anion. Name this anion.
(iii) Give a possible cation which gives the green solution.
i)ammonia gas
ii) nitrate ion
iii) iron(II) ions
Q4 Sulfuric acid is titrated with potassium hydroxide in the preparation of potassium sulfate salt.
(i) Explain why this method is recommended for the preparation for this salt.
(ii) Write an ionic equation for the reaction.
i) they are soluble and colourless , titration method with an indicator can determine the end point of the neutralization between the acid and the alkaline . and group I salt is produced
ii) 2H+ [aq] + 2OH- [aq] → 2H2O [l]
Q5 Excess zinc carbonate is added to hydrochloric acid in the preparation of zinc chloride salt.
(i) Write an ionic equation for the reaction.
(ii) Why excess zinc carbonate is used?
(iii) Briefly explain how the zinc chloride crystals can be obtained.
i) ZnCO3 [s] + 2H+ [aq] → Zn2+ [aq] + CO2 [g] + H2O [l]
ii) excess zinc carbonate is added to ensure the acid is completely reacted
iii) add excess zinc carbonate to hydrochloric acid , filter all out excess zinc carbonate and boil the solution in a evaporating dish , control the fire to prevent salts from " jumping " out . let the solution to cool under a fan and zinc chloride crystal is formed .
credits :
http://www.answers.com/topic/anionic
http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA4/MVHTM/ZNNO/ZNNONH3X.HTM
http://www.blurtit.com/q8525847.html
Q5 Excess zinc carbonate is added to hydrochloric acid in the preparation of zinc chloride salt.
(i) Write an ionic equation for the reaction.
(ii) Why excess zinc carbonate is used?
(iii) Briefly explain how the zinc chloride crystals can be obtained.
i) ZnCO3 [s] + 2H+ [aq] → Zn2+ [aq] + CO2 [g] + H2O [l]
ii) excess zinc carbonate is added to ensure the acid is completely reacted
iii) add excess zinc carbonate to hydrochloric acid , filter all out excess zinc carbonate and boil the solution in a evaporating dish , control the fire to prevent salts from " jumping " out . let the solution to cool under a fan and zinc chloride crystal is formed .
credits :
http://www.answers.com/topic/anionic
http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA4/MVHTM/ZNNO/ZNNONH3X.HTM
http://www.blurtit.com/q8525847.html
