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<p>[QUOTE=&quot;foundinrolls, post: 1803453, member: 4350&quot;]No,&nbsp; we didn&#039;t do the after weight of the coins since the whole class did it there would have been all kinds of variations since not everyone stopped the reaction at the same time.</p><p><br /></p><p>It was just to show that nitric acid and copper reacted together.&nbsp;&nbsp; It wasn&#039;t an experiment to figure out everything about the reaction.&nbsp; </p><p><br /></p><p>It wasn&#039;t my idea, but the professor told us to stop the reaction by adding water directly into the reaction in the flask.&nbsp; There wasn&#039;t much of a reaction ( just some minor bubbling.&nbsp;&nbsp; I expected more of a reaction but, this is just a guess,&nbsp; maybe the suspended copper ions did something to the acid water reaction to calm it a bit.&nbsp; Like I said though we didn&#039;t take measurements of the aftermath. </p><p><br /></p><p>And yeah,&nbsp; it would have been interesting to take final measurements but it was just a short lab period.[/QUOTE]</p><p><br /></p>

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