Calling all Chem Prodigies

Test Preparation
1

<p>"Silver chloride is a compound that readily forms a colloidal suspension... Nitric acid was added to the solution (aqueous AgCl) when the silver chloride was precipitated in order to prevent colloid formation... Describe what the nitric acid does."</p>

<p>...Help?</p>

<p>I've found something about HNO3 stabilizing AgCl when it was being heated (after mixing all the chemicals together)... and something about pH. (<a href="http://72.14.203.104/search?q=cache:ey3DCMa50nUJ:www.lwpub.com/downloads/CS_archives/archives/CSProperties.PDF+nitric+acid++silver+chloride+colloid&hl=en&client=firefox-a%5B/url%5D"&gt;http://72.14.203.104/search?q=cache:ey3DCMa50nUJ:www.lwpub.com/downloads/CS_archives/archives/CSProperties.PDF+nitric+acid++silver+chloride+colloid&hl=en&client=firefox-a&lt;/a&gt;)&lt;/p>

2

<p>It simply stops the percipitation of AgCl...the solution now becomes ions of Ag+, Cl-, H+ and NO3- because of solubility rules.</p>

3

<p>I thought the nitric acid PROMOTES precipitation, since that's what happened after we added it lol.</p>

4

<ol>
<li>Most silver salts are insoluble. AgNO3 and Ag(C2H3O2) are common soluble salts of silver; virtually anything else is insoluble. </li>
</ol>

<p>Nope, must have been a fluke.</p>

5

<p>The final precipitate was AgCl. I just have to figure out why we added NO3-. The questions tells you it prevented colloid formation, but I have to find out how.</p>

6

<p>Lol, this is the reaction that occurs:</p>

<p>AgCl (s) + HNO3 = AgNO3 + HCl (both the products are soluble and revert to ionic form by the solubility rules) Make sure you memorize those rules for reactions. NO3- breaks up the preciptate by forming hydrochloric acid...its a simple weak base forming a strong acid combo with AgCl being the ionic salt</p>

7

<p>Y'all are smart</p>