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Topic: What is the equation for EDTA with calcium ions  (Read 15037 times)

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Offline Confused

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What is the equation for EDTA with calcium ions
« on: May 30, 2006, 02:27:41 AM »
How do you simply make up an equation if you're not given anything but the names?
« Last Edit: May 30, 2006, 11:21:47 AM by Mitch »
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Offline Mitch

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Re: Making an equation
« Reply #1 on: May 30, 2006, 02:40:53 AM »
Please be more specific. How are we suppose to answer that?
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Offline Borek

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Re: Making an equation
« Reply #2 on: May 30, 2006, 03:13:33 AM »
I suppose the question is about how to translate "silver nitrate reacts with sodium chloride yielding silver chloride and sodium nitrate" into

AgNO3 + NaCl -> AgCl + NaNO3

Just start with writing all named compounds formulas.
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Offline Confused

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Re: Making an equation
« Reply #3 on: May 30, 2006, 03:51:12 AM »
Sorry, that was a stupid way to put it... The question just says... What is the equation for EDTA with calcium ions>
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Offline AWK

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Re: Making an equation
« Reply #4 on: May 30, 2006, 04:37:14 AM »
EDTA - disodium ethylenediamine tetraacetate  (Na2C10H14N2O8)
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Offline Confused

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Re: Making an equation
« Reply #5 on: May 30, 2006, 07:57:44 AM »
Yep, so how do I write out the whole equation for the reaction?

It would be Na2C10H14N2O8 + CaCO3 (Or just straight Ca?)  --->  (??) ... Then I dont know how to figure out the next part...
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Offline Albert

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Re: What is the equation for EDTA with calcium ions
« Reply #6 on: May 30, 2006, 03:11:23 PM »
It depends on the pH in the solution. Generally, you set pH at 10. Hence, the chemical equation is:

Ca2+ + Y4- -> CaY2-

or, put in other words,

Ca2+ + Na4N2(CH2COO)4 -> 4Na+ + CaN2(CH2COO)42-
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