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(d) Al2S3 5.41 Use the solubility guidelines in Section 5.3 to predict whether a precipitation reaction will occur when aqueous solutions of the following substances are mixed. (a) NaOH HCIO4 (b) FeCl2 + KOH (c) (NH4)2SO4 + NiCh 5.5
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Answer #1

5.41

(a) No precipitation will form, sodium hydroxide can't be oxidized by hyperchloric acid.
NaOH + HClO4 --> NaClO4 + H2O

(b) You get insoluble Fe(OH)2
FeCl2(aq) + 2 KOH(aq) --> Fe(OH)2(s) + 2 KCl

(c) No precipitate will form.
(NH4)2SO4 + NiCl2? -->? NiSO4 (aq) + 2NH4Cl

5.42

(a) 2NaBr (aq) + Hg2(NO3)2 (aq) ------> 2NaNO3(aq) + Hg2Br2 (s)

(b) CuCl2(aq) + K2SO4(aq) ------> CuSO4(aq) + KCl(aq)

(c) 2LiNO3(aq) + Ca(CH3CO2)2(aq) ------> Ca(NO3)2(aq) + 2Li(CH3CO2)(aq)

(d) (NH4)2CO3(aq) + CaCl2(aq) ------> CaCO3(s) + 2NH4Cl(aq)

(e) 2KOH(aq) + MnBr2(aq) ------> Mn(OH)2(s) + 2KBr(aq)

(f) 3Na2S(aq) + 2Al(NO3)3(aq) ------> Al2S3(s) + 6NaNO3(aq)

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