6 Questions
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 $H_2SO_4(aq)$.
White precipitate
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 $HCl$?
Green-yellow solution
What precipitate is formed when $Fe^{3+}$ reacts with $Na_2CO_3(aq)$, and what additional observation can be made?
Green precipitate and gentle effervescence
What happens when $Ba^{2+}$ reacts with dilute $H_2SO_4(aq)$?
White precipitate
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
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.
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