1)MnSO4(aq) is converted to MnO2(s) in a basic medium as oxygen gas is converted
ID: 731690 • Letter: 1
Question
1)MnSO4(aq) is converted to MnO2(s) in a basic medium as oxygen gas is converted to hydroxide ion. In this case is the sulfate ion a spectator ion? (NaOH is also present. Is sodium ion also a spectator ion?)2) Chromium(III) hydroxide, an insoluble solid, is converted to aqueous sodium chromate by commercial bleach, aqueous sodium hypochlorite, in a basic medium. This process is dangerous because the other product is chlorine gas. (This may be a challenging balance: Recommend that half-equations be balanced first.)
3)Mixing bleach (sodium hypochlorite) and ammonia is extremely dangerous, since toxic vapors will be produced. Explain why this is a dangerous situation using a least one balance redox equation.
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Explanation / Answer
The bleach decomposes to form hydrochloric acid, which reacts with ammonia to form toxic chloramine fumes: First the hydrochloric acid is formed: NaOCl ? NaOH + HOCl HOCl ? HCl + O And then the ammonia and chlorine gas react to form chloramine, which is released as a vapor: NaOCl + 2HCl ? Cl2 + NaCl + H2O 2NH3 + Cl2 ? 2NH2Cl If ammonia is present in excess (which it may or may not be, depending on your mixture), toxic and potentially explosive liquid hydrazine may be formed. While impure hydrazine tends not to explode, it's still toxic, plus it can boil and spray hot toxic liquid. 2NH3 + NaOCl ? N2H4 + NaCl + H2O
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