A. Fe2+(aq)+2OH−(aq)→Fe(OH)2( s)\mathrm{Fe}^{2+}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq}) \rightarrow \mathrm{Fe}(\mathrm{OH})_{2}(\mathrm{~s})Fe2+(aq)+2OH−(aq)→Fe(OH)2( s)
B. CH3COOH(aq)+H2O(ℓ)⇌H3O+(aq)+CH3COO−(aq)\mathrm{CH}_{3} \mathrm{COOH}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\ell) \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq})+\mathrm{CH}_{3} \mathrm{COO}^{-}(\mathrm{aq})CH3COOH(aq)+H2O(ℓ)⇌H3O+(aq)+CH3COO−(aq)
C. 2AgNO3(aq)+CaCl2(aq)→2AgCl(s)+Ca(NO3)2(aq)2 \mathrm{AgNO}_{3}(\mathrm{aq})+\mathrm{CaCl}_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{AgCl}(\mathrm{s})+\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})2AgNO3(aq)+CaCl2(aq)→2AgCl(s)+Ca(NO3)2(aq)
D. 2H2O(ℓ)+2Na(s)→2NaOH(aq)+H2( g)2 \mathrm{H}_{2} \mathrm{O}(\ell)+2 \mathrm{Na}(\mathrm{s}) \rightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})2H2O(ℓ)+2Na(s)→2NaOH(aq)+H2( g)
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