Podcast
Questions and Answers
Which of the following metal hydroxides is soluble in excess ammonium hydroxide?
Which of the following metal hydroxides is soluble in excess ammonium hydroxide?
- Al(OH)₃
- Fe(OH)₂
- Mg(OH)₂
- AgOH (correct)
When $Fe^{3+}$ reacts with SCN⁻, what type of compound is formed?
When $Fe^{3+}$ reacts with SCN⁻, what type of compound is formed?
- A complex ion (correct)
- A precipitate
- A gaseous product
- A strong acid
Which of these hydroxides is insoluble in $OH^-$?
Which of these hydroxides is insoluble in $OH^-$?
- Pb(OH)₄²⁻
- Fe(OH)₂ (correct)
- Zn(OH)₄²⁻
- Al(OH)₄⁻
Identify which of the following metal ions will NOT form an insoluble hydroxide precipitate upon addition of $OH^−$?
Identify which of the following metal ions will NOT form an insoluble hydroxide precipitate upon addition of $OH^−$?
Which of the following ions will form a tetraammine complex in the presence of excess ammonia?
Which of the following ions will form a tetraammine complex in the presence of excess ammonia?
Based on the provided reactions, which of the following statements is correct regarding the behavior of $Al^{3+}$ in the presence of hydroxide ions?
Based on the provided reactions, which of the following statements is correct regarding the behavior of $Al^{3+}$ in the presence of hydroxide ions?
What is the general trend regarding the solubility of hydroxide compounds based on the reactions provided?
What is the general trend regarding the solubility of hydroxide compounds based on the reactions provided?
Consider the reaction of $Ba^{2+}$ with $SO₄^{2−}$. Which of the following is true about this reaction?
Consider the reaction of $Ba^{2+}$ with $SO₄^{2−}$. Which of the following is true about this reaction?
For the reactions shown, what is the oxidation state of iron in the precipitate $Fe(OH)₂$?
For the reactions shown, what is the oxidation state of iron in the precipitate $Fe(OH)₂$?
Based on the reactions, which of the following cations will form an insoluble hydroxide, but will re-dissolve upon the addition of excess hydroxide?
Based on the reactions, which of the following cations will form an insoluble hydroxide, but will re-dissolve upon the addition of excess hydroxide?
Flashcards
Mg(OH)₂
Mg(OH)₂
Magnesium hydroxide, a solid precipitate formed from magnesium ions and hydroxide ions.
AgOH (s)
AgOH (s)
Silver hydroxide, a solid precipitate.
[Ag(NH₃)₂]⁺(aq)
[Ag(NH₃)₂]⁺(aq)
Complex ion formed when silver ions react with ammonia.
Fe(OH)₂ (s)
Fe(OH)₂ (s)
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[FeSCN]²⁺ (aq)
[FeSCN]²⁺ (aq)
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Cu(OH)₂ (s)
Cu(OH)₂ (s)
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[Cu(NH₃)₄]²⁺ (aq)
[Cu(NH₃)₄]²⁺ (aq)
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Al(OH)₃ (s)
Al(OH)₃ (s)
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[Al(OH)₄]⁻(aq)
[Al(OH)₄]⁻(aq)
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Insoluble Hydroxides
Insoluble Hydroxides
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Study Notes
- Mg²⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s)
- Ag⁺(aq) + OH⁻(aq) → AgOH(s)
- Ag⁺(aq) + 2NH₃(aq) → [Ag(NH₃)₂]⁺(aq)
- Fe²⁺(aq) + 2OH⁻(aq) → Fe(OH)₂(s)
- Fe³⁺(aq) + 3OH⁻(aq) → Fe(OH)₃(s)
- Fe³⁺(aq) + SCN⁻(aq) → [FeSCN]²⁺(aq)
- Cu²⁺(aq) + 2OH⁻(aq) → Cu(OH)₂(s)
- Cu²⁺(aq) + 4NH₃(aq) → [Cu(NH₃)₄]²⁺(aq)
- Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)
- Al³⁺(aq) + 4OH⁻(aq) → [Al(OH)₄]⁻(aq)
- Pb²⁺(aq) + 2OH⁻(aq) → Pb(OH)₂(s)
- Pb²⁺(aq) + 4OH⁻(aq) → [Pb(OH)₄]²⁻(aq)
- Zn²⁺(aq) + 2OH⁻(aq) → Zn(OH)₂(s)
- Zn²⁺(aq) + 4NH₄(aq) → [Zn(NH₃)₄]²⁺(aq)
- Zn²⁺(aq) + 4OH⁻(aq) → [Zn(OH)₄]²⁻(aq)
- Ba²⁺(aq) + 2OH⁻(aq) → Ba(OH)₂(s)
- Ba²⁺(aq) + SO₄²⁻(aq) → BaSO₄(s)
Precipitation of Iron(II) Hydroxide
- Fe(OH)₂ is produced from the identification of Fe²⁺
- Fe(OH)₂ is insoluble
- Oxides and hydroxides are generally insoluble, with exceptions of group 1 elements and ammonium ion
- Iron(II) is not a group 1 element nor ammonium ion.
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