Solving Zn(NO3)2 and Al(NO3)3 Problems with NaOH

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SUMMARY

The discussion focuses on the reactions of zinc nitrate (Zn(NO3)2) and aluminum nitrate (Al(NO3)3) with sodium hydroxide (NaOH). When NaOH is added to Zn(NO3)2, zinc hydroxide (Zn(OH)2) precipitates, but further addition of NaOH dissolves it into sodium zincate (Na2ZnO2). Similarly, Al(NO3)3 reacts with NaOH to form aluminum hydroxide (Al(OH)3), which can also dissolve into sodium aluminate (NaAlO2) upon additional NaOH. The key issue arises from the tendency of cations to react with hydroxide ions, leading to the formation of soluble hydroxo complex ions.

PREREQUISITES
  • Understanding of chemical reactions involving metal nitrates and hydroxides
  • Knowledge of precipitation and solubility principles in inorganic chemistry
  • Familiarity with the concepts of complex ion formation
  • Basic knowledge of stoichiometry and balanced chemical equations
NEXT STEPS
  • Research the solubility rules for metal hydroxides and their complex ions
  • Study the properties and applications of sodium zincate (Na2ZnO2)
  • Explore the formation and uses of sodium aluminate (NaAlO2) in industrial processes
  • Investigate the role of pH in precipitation and dissolution reactions
USEFUL FOR

Chemistry students, chemical engineers, and laboratory technicians involved in inorganic synthesis and precipitation reactions.

dagg3r
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Zn(NO3)2 problem!

Zn(NO3)2 will react with NaOH, precipitate will form, but continueing adding sodium hydroxide will dissolve Zn(OH)2.

2NaOH + Zn(NO3)2 -> Zn(OH)2 + 2NaNO3

Zn(OH)2 + 2NaOH -> Na2ZnO2 + 2H2O

It happens similarly with Al(NO3)3 reacting with NaOH.

3NaOH + Al(NO3)3 -> Al(OH)3 + 3NaNO3

Al(OH)3 + NaOH -> NaAlO2 + 2H2O
 
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So what is the problem?

The Bob (2004 ©)
 
Post Trans. cations react extensively with OH- and ppts tend to dissolve as metal ions converts to a soluable hydroxo complex ion.
 

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