February 2nd, 2010 
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Iii Vacuum
Net ionic equations?
I am stuck on these problems and my textbook barely mentions anything about net ionic equations. Does anyone know the net ionic equation for the following:
1) Solid calcium carbonate is heated in a vacuum.
2) Equal volumes of equimolar solutions of phosphoric acid and calcium hydroxide are mixed.
3) Powdered strontium oxide is added to distilled water.
4) Chlorine gas is bubbled through a solution of potassium bromide.
5) Carbon monoxide gas is passed over hot iron(III) oxide.
Also, what is the significance of distilled water in net ionic equations? I have a couple net ionic equations regarding distilled water...And if you have any helpful websites on net equations, please give me the link. Thanks!
net ionic equations are chemical equations that show the disociation of an ionic compound into it's ions. calcuim carbonate heated in a vacuum would just disociate into its components so: CaCO3 -> (Ca2+) + ((CO3) 2-). I just used parenthesis to seperate all the plus signs but I think you get the idea. CO3 is a polyatomic ion (an ion of multiple moclues that carries a net charge, It will act as a single atom does. you can usually regocnize them because they are made up of non metals).
So , the for second one you would just write out the formulas of both substances. If they are both a "strong" acid or base they'll dissociate completely leaving only their ions in solution. If they are a weak acid or base they will only partially disocciate so you will have some of the original substace in solution, not just the ions. If you haven't talked about stong acids or bases in class i would just assume they are both stong and write out ions only. I haven't done these in a while and I can't remember if they are both strong.
So basically all you need to do is take the original substances and write them on one side of the equation and then break them down into their ions and write each ion out with it's charge on the other side. Then balance. The situations they give are simply situations where they would decompose into their ions.
The only reason they mention distilled water is that they want you to assume that the compounds mentioned are the only things in the water. Otherwise there might be impurities like other minerals and chlorine in the solutions if tap water were used.
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Vintage Kirby Classic III vacuum
Is a general service type needle valve suitable to be installed for the following cases?
1. a vacuum system outlet?
2. a compressed air outlet?
3. a propane gas system outlet?
These outlets are to be installed in a new bio-security laboratory, level III
It's probably OK for propane and compressed air, they will have a a considerable amount of pressure to give you the flow you want. But you may want to specify a plug type valve for the vacuum system, you only get one atmosphere of dP and a needle valve has a relatively small opening area. If you want a good flow into your vacuum system, a plug or ball valve will have the same opening as the pipe when fully open, and they are not bad at regulating flow when partially closed, either.
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