Reactions With Dilute Hydrochloric Acid

In summary, the conversation discusses the formation of HBr through a reaction with NaBr and HCl. The speaker suggests that HBr would be a gas and denser than air due to its molar mass, but this is not the correct answer. The error is in the reaction, specifically with the use of diluted acid. The other alternative, Pb(NO3)2, would form PbCl2 and HNO3 with HCl, but not as a gas. The speaker's thinking is correct, but they cannot find reliable sources for these reactions.
  • #1
A13235378
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Homework Statement
In one of the exercises on inorganic reactions in my test, it consisted of marking the alternative in which a solid substance at 25 degrees Celsius reacted with diluted HCl and formed a gas denser than atmospheric air.
Relevant Equations
HCl + NaBr = NaCl + HBr
One of the alternatives was NaBr

My resolution was as follows:

NaBr + HCl forms NaCl and HBr

I researched and saw that HBr would be a gas and would be denser than air because its molar mass is greater.

However, the answer was not that.

My error is in which step?

In the reaction? What would be correct?

Furthermore, the other alternative presents the substance Pb(NO3)2

Reaction with HCl would form PbCl2 and HNO3, not forming gas.

Is my thinking correct?

I can't find reliable sources with these reactions made.

Thanks for the help.
 
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  • #2
Problem is with the reaction and the _diluted_ acid.
 
  • #3
Borek said:
Problem is with the reaction and the _diluted_ acid.
And how would the reaction be with the diluted acid?
 
  • #4
There would be none.

Some quantities of HBr can be probably produced with concentrated HCl, but even that is not listed as a viable way of lab synthesis. It will be probably way too contaminated with just HCl.
 

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