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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: mememehere on December 05, 2009, 02:44:49 AM

Title: What is the effect of concentrated acid, etc?
Post by: mememehere on December 05, 2009, 02:44:49 AM

What are the effects of concentrated acid? Just list em' all.

Then which is stronger, DILUTED H3PO4 OR HCL? And why? Does the basicity matters? And the basicity shall matters, in what circumstances?

What shall be the differences and results, when DILUTED acid react with a metal, compared to a Concentrated acid?

Title: Re: What is the effect of concentrated acid, etc?
Post by: Borek on December 05, 2009, 04:48:07 AM

Your questions are ambiguous to the point where they are unanswerable.

Title: Re: What is the effect of concentrated acid, etc?
Post by: nj_bartel on December 05, 2009, 08:40:40 PM

The last one is answerable.  Slower less vigorous reaction.

Title: Re: What is the effect of concentrated acid, etc?
Post by: 408 on December 05, 2009, 09:29:44 PM

nj...

Up to a point yes, if we are talking 5% HCl vs 37 % HCl
However for something like sulfuric acid, 100% sulfuric will react with metals much slower, than say, 25%, or not at all after a brief instance of passivation.  This is based on the common ion effect where the formed metal sulfates do not dissolve in concentrated sulfuric, and the sulfates block off further reaction with the metal surface.

Title: Re: What is the effect of concentrated acid, etc?
Post by: nj_bartel on December 05, 2009, 10:51:15 PM

Fair enough :)

Title: Re: What is the effect of concentrated acid, etc?
Post by: mememehere on December 06, 2009, 05:28:11 AM

yeah right. what's wrong wif my qns again?

Title: Re: What is the effect of concentrated acid, etc?
Post by: Borek on December 06, 2009, 06:53:58 AM

"Concentrated" and "diluted" are not well defined.

"Strength" of the acid can be described in terms of its dissociation constant, but it is not concentration dependent, so it doesn't make sense to ask "which is stronger when diluted".

Title: Re: What is the effect of concentrated acid, etc?
Post by: mememehere on December 06, 2009, 09:21:11 PM

Oh i see. Hmmm... then what are the suggested rephrased sentences? :-\

Title: Re: What is the effect of concentrated acid, etc?
Post by: Borek on December 07, 2009, 03:06:15 AM

Hard to suggest better wording of the question not knowing what you really want to ask about. Please elaborate.

Title: Re: What is the effect of concentrated acid, etc?
Post by: JGK on December 07, 2009, 11:30:18 AM

Quote from: mememehere on December 05, 2009, 02:44:49 AM

What are the effects of concentrated acid? Just list em' all.

http://lmgtfy.com/?q=What+are+the+effects+of+concentrated+acids (http://lmgtfy.com/?q=What+are+the+effects+of+concentrated+acids)

http://lmgtfy.com/?q=concentrated+acids (http://lmgtfy.com/?q=concentrated+acids)