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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: stylerz on January 01, 2005, 03:00:00 AM

Title: hydrazine reaction
Post by: stylerz on January 01, 2005, 03:00:00 AM

can anyone give me the reaction eqn when hydrazine(N2H4) reacts with excess concentrated HCl? Will ammonium chloride be formed?
thanks

Title: Re:hydrazine reaction
Post by: NISHANT on January 01, 2005, 12:45:42 PM

yup. NH2-NH2 BOND WILL BREAK AND HYDRAZINE WILL CONVERT TO AMMONIA AND THEN NH4Cl.
bye

Title: Re:hydrazine reaction
Post by: kevins on January 02, 2005, 10:25:41 AM

NISHANT,

Are you sure the reaction? If yes, I would like to know how to make a compound of Hydrazine hydrochloride?
I think the reaction should be (N2H4)HCl and no NH4Cl.

Title: Re:hydrazine reaction
Post by: hannibal on June 14, 2005, 02:51:33 AM

Quote from: NISHANT on January 01, 2005, 12:45:42 PM

yup. NH2-NH2 BOND WILL BREAK AND HYDRAZINE WILL CONVERT TO AMMONIA AND THEN NH4Cl.
bye

well i dont think this is true because in production of hydrazine from hypochlorite and urea we add HCl to nutralise sodium bi carbonate.sodium bi carbonate is a side product in the reaction.

Title: Re:hydrazine reaction
Post by: woelen on June 14, 2005, 04:32:14 AM

The reaction between hydrazine and HCl is very simple and completeluy analogous to the reaction between ammonia and HCl. In a solution of HCl you have H(+) and Cl(-) ions. The Cl(-) ions do nothing and are spectator ions.

With ammonia you have:
NH₃(aq) + H⁺ ---> NH₄⁺(aq)

On evaporation you get ammonium chloride NH₄Cl.

Completely analogous is the reaction with hydrazine:


N₂H₄(aq) + H⁺ ---> N₂H₅⁺(aq)

On evaporation you get hydrazinium chloride N₂H₅Cl (this also is called hydrazine monohydrochloride and written as N2H4.HCl, but the latter notation is not really good).


In excess acid, the reaction even goes further on the other NH2-group of hydrazine:

N₂H₅⁺(aq) + H⁺ ---> N₂H₆²⁺(aq)

On evaporation you get N₂H₆Cl₂ (this is called hydrazine dihydrochloride and written as N2H4.2HCl, but the latter notation is not really good).

The latter salt is commercially available (in fact, I have some in my home lab and it is a white crystalline solid, which is quite acidic, when dissolved in water).

Title: Re:hydrazine reaction
Post by: xiankai on June 14, 2005, 08:21:04 AM

Quote from: woelen on June 14, 2005, 04:32:14 AM

The reaction between hydrazine and HCl is very simple and completeluy analogous to the reaction between ammonia and HCl. In a solution of HCl you have H(+) and Cl(-) ions. The Cl(-) ions do nothing and are spectator ions.

With ammonia you have:
NH₃(aq) + H⁺ ---> NH₄⁺(aq)

On evaporation you get ammonium chloride NH₄Cl.

Completely analogous is the reaction with hydrazine:


N₂H₄(aq) + H⁺ ---> N₂H₅⁺(aq)

On evaporation you get hydrazinium chloride N₂H₅Cl (this also is called hydrazine monohydrochloride and written as N2H4.HCl, but the latter notation is not really good).


In excess acid, the reaction even goes further on the other NH2-group of hydrazine:

N₂H₅⁺(aq) + H⁺ ---> N₂H₆²⁺(aq)

On evaporation you get N₂H₆Cl₂ (this is called hydrazine dihydrochloride and written as N2H4.2HCl, but the latter notation is not really good).

The latter salt is commercially available (in fact, I have some in my home lab and it is a white crystalline solid, which is quite acidic, when dissolved in water).

the reactions are familar to that of addition reactions of hydrocarbons with functional groups, could that be due to the amine(NH2-NH2) bonds?