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Questions and Answers
What precipitate is formed when $Mg^{2+}$ reacts with $NaOH(aq)$ and is it soluble or insoluble in excess?
What precipitate is formed when $Mg^{2+}$ reacts with $NaOH(aq)$ and is it soluble or insoluble in excess?
White precipitate, insoluble in excess
Describe the reaction of $Ca^{2+}$ with dilute $H_2SO_4(aq)$.
Describe the reaction of $Ca^{2+}$ with dilute $H_2SO_4(aq)$.
White precipitate
What observation is made when $NH_4^+$ reacts with $NaOH(aq)$?
What observation is made when $NH_4^+$ reacts with $NaOH(aq)$?
On warming, releases a gas that turns damp red litmus paper blue.
What color change occurs when $Cu^{2+}$ reacts with concentrated $HCl$?
What color change occurs when $Cu^{2+}$ reacts with concentrated $HCl$?
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What precipitate is formed when $Fe^{3+}$ reacts with $Na_2CO_3(aq)$, and what additional observation can be made?
What precipitate is formed when $Fe^{3+}$ reacts with $Na_2CO_3(aq)$, and what additional observation can be made?
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What happens when $Ba^{2+}$ reacts with dilute $H_2SO_4(aq)$?
What happens when $Ba^{2+}$ reacts with dilute $H_2SO_4(aq)$?
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Study Notes
Reactions of Metal Ions with NaOH
- Mg2+ reacts with NaOH to form a white precipitate of Mg(OH)2
- Ca2+ reacts with NaOH to form a white precipitate of Ca(OH)2
- Cu2+ reacts with NaOH to form a blue precipitate, insoluble in excess, forming [Cu(H2O)4(OH)2]
- Fe2+ reacts with NaOH to form a green precipitate, insoluble in excess, forming [Fe(H2O)4(OH)2]
Reactions of Metal Ions with NH3
- Cu2+ reacts with NH3 to form a blue precipitate, soluble in excess, forming [Cu(H2O)2(NH3)4]2+
- Fe2+ reacts with NH3 to form a green precipitate, insoluble in excess
Reactions of Metal Ions with Na2CO3
- Cu2+ reacts with Na2CO3 to form a blue-green precipitate of CuCO3
Reactions of Metal Ions with Dilute H2SO4
- Ca2+ reacts with dilute H2SO4 to form a white precipitate of CaSO4
- Sr2+ reacts with dilute H2SO4 to form a white precipitate of SrSO4
- Ba2+ reacts with dilute H2SO4 to form a white precipitate of BaSO4
Reactions of Metal Ions with Concentrated HCl
- Cu2+ reacts with concentrated HCl to form a green-yellow solution of [CuCl4]2-
Reactions of Metal Ions with Other Reagents
- NH4+ reacts with NaOH to release a gas that turns damp red litmus paper blue
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Description
This quiz summarizes the reactions of different metal ions with NaOH, NH3, Na2CO3, dilute H2SO4, and concentrated HCl. Identifying the reactions helps to understand chemical properties of metal ions.
