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Remember that both these metals are amphoteric, they can react both with bases as well as with acids. Therefore, under baisc (NH4OH = NH3 + H2O) conditions you initially would pptate the hydroxides (Al(OH)3 or Zn(OH)2) but if the medium is very basic these hydroxides will dissolve and form anions containing the metal, aluminate [ (Al(OH)4 ]- and / or zincate [ Zn(OH)4 ]=. If you add H2S your Zn2+ ions end up pptating as ZnS, quite insoluble salt.

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Q: Why is nh4cl added before nh4oh in salt analysis?
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Related questions

What is the chemical equation when ammonium chloride is added to sodium hydroxide to form salt and ammonium hydroxide?

NH4Cl + NaOH ---> NaCl + NH4OH


What happens when you add more NH4Cl to Magnesium hydroxide?

2 NH4Cl +Mg(OH)2 -> 2 NH4OH + MgCl2


What is the cation of NH4Cl?

NH4 with a charge of +1.


What is a balanced equation for hydrochloric acid with ammonium hydroxide?

HCl + NH4OH -> H2O + NH4Cl


What is the balance equation for heating NH4Cl with KOH?

NH4Cl + KOH becomes KCl + NH4OH which latter in essence is ammonia and water. The ammonia escapes from the mixture as a gas.


Is nh3 and nh4cl a buffer?

this is buffer system consisted of a weak base and its conjugated base. NH4OH is the weak acid and the NH4Cl is the conjugated base. when an acid or a base is added in small amount the change of the pH of this solution is neglegible hence we tells that this shows a resistivity when adding an acid or a base .when an acid is added OH ions reacts and form H2O and NH4OH dissociates and give the OH ions to the solution .When an base is added NH+ ions react with OH ions added and form NH4OH which dissociates weakly to NH+ ions and OH- ions .


What is a balanced equation for the reaction of hydrochloric acid and ammonia solution?

a balanced equation for the reaction of hydrochloric acid and ammonia solution is given below.HCL(aq) + NH3(l) ---> NH4+(aq) + Cl-(aq) complete .This is the balanced chemical equation .


What is the chemical name for the salt which comes from a mixture of hydrochloride and ammonia water?

The chemical name for the salt which comes from a mixture of hydrochloride and ammonia water is ammonium chloride.Ammonia (NH3) reacts with water to form ammonium hydroxide (NH4OH), and when reacted with hydrochloric acid, the Cl- anion dispaces the OH- to give us the ammonium chloride (NH4Cl), while the displaced hydroxide and the H+ of the HCl get together to form a water molecule.NH3 + H2O ---> NH4OH, and NH4OH + HCl ---> NH4Cl + H2OSince a water molecule is a reactant and a product, we can ignore it and the reaction becomes:NH3 + HCl ---> NH4Cl


Ammonia hydrochloric acid?

There are two possible representations of this. NH3(aq) + HCl(aq) --> NH4Cl(aq) or NH4OH + HCl --> NH4Cl + H2O However, this second equations is not entirely accurate as only small amounts of NH4OH will form in an ammonia solution.


If a bottle of concentrated HCL if placed next to a bottle of concentrated NH4OH what is the white residue that eventually coats each bottle?

NH4Cl - Ammonium Chloride


What is the double replacement for ammonium chloride plus calcium hydroxide?

The chemical reaction is:2 NH4Cl + Ca(OH)2 = 2 NH4OH + CaCl2


How can reaction with ammonium acetate from acetic acid?

An example:HCl + NH4OH----------------NH4Cl + H2O