Home » Ask & Discuss » Chemistry. » Physical Chemistry « Back to Discussion

Physical Chemistry

New kid on the Block

Joined:	23 Nov 2009
Post:	3

23 Nov 2009 13:30:51 IST

0 People liked this

120

I am totally confused in this question pleez help somebody....urrgent..... A sample of Mg burnt in

None

I am totally confused in this question pleez help somebody....urrgent.....A sample of Mg burnt in air to give MgO and Mg3N2. The ash was dissolved in 60 m eq HCl & resulting solution was back titrated with NaOH. 12 m eq of NaOH were required to reach the end point. The excess NaOH was then added and solution distilled. The ammonia released was trapped in 10 m eq of second acid solution. Back titration of this solution required 6 m eq of base. calculate % Mg burnt to nitride.

Share this article on:

Comments (1)

Krishna Gopal Singh

Forum Expert

Joined: 29 Dec 2006

Posts: 4965

10 Mar 2010 21:14:03 IST

Like 0 people liked this

Let meq of MgO and Mg3N2 are x and y respectivly.From first datax+ y = 60-12 = 48Three meq of Mg2N3 will give 1 meq of NH3 Soy/3 = 10-6 = 4So y = 12 and x = 48-12 = 36So 12*100/48 = 25% Mg was burnt to nitride

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team