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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: shalikadm on May 26, 2013, 11:17:02 AM

Title: whats the role of acetic acid in these reactions ?
Post by: shalikadm on May 26, 2013, 11:17:02 AM

1.

Quote from: my book

When even newly prepared FeSO₄ with sulfuric acid or acetic acid added to the nitrite solution we can notice the brown ring.

2.

Quote from: my book

2KNO₃+2KI+4CH₃COOH :rarrow: 2NO+I₂+4CH₃COOK

In above two quotations from my book, what is the role of acetic acid ?
Does it represent that H⁺ given even by a week acid is sufficient for the reaction or something else ?

Title: Re: whats the role of acetic acid in these reactions ?
Post by: shalikadm on June 01, 2013, 08:14:35 AM

any one there ?

Title: Re: whats the role of acetic acid in these reactions ?
Post by: Borek on June 01, 2013, 09:11:25 AM

Yes, acetic acid is strong enough for brown ring test.

Although it depends on the details. I think it is strong enough when testing for nitrites, but not strong enough when testing for nitrates.

Title: Re: whats the role of acetic acid in these reactions ?
Post by: shalikadm on June 01, 2013, 09:18:19 AM

Is it the same thing for the second example..?strength sufficiency..?
Thanks a million sir...I was unable to move on since...can you please answer my other question....?
http://www.chemicalforums.com/index.php?topic=68474.0 (http://www.chemicalforums.com/index.php?topic=68474.0)