2 Positive X-Values in ICE Table
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2 Positive X-Values in ICE Table
When using the ICE table to solve for x, if you are given two positive x values, how do you know which one to use?
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Re: 2 Positive X-Values in ICE Table
Very rarely will there be two positive x values; however, in the case that this occurs, you should individually subtract both x values from the initial concentration provided by the problem. If one of the x values provides a negative equilibrium value for concentration, then the other x value should be selected.
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Re: 2 Positive X-Values in ICE Table
Hello! Like the reply above, if you do get 2 positive values when solving the quadratic, then plug them both in the original equation and disregard the x that gives you a negative value.
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Re: 2 Positive X-Values in ICE Table
Hello,
Whenever you get two positive values, one is normally going to be larger than the initial concentrations given. Because of this, subtracting from the initial concentration would give you a negative concentration which isn't possible. Therefore, you would want to compare the values and use the one that gives you a positive, not a negative.
Hope this helps! :)
Whenever you get two positive values, one is normally going to be larger than the initial concentrations given. Because of this, subtracting from the initial concentration would give you a negative concentration which isn't possible. Therefore, you would want to compare the values and use the one that gives you a positive, not a negative.
Hope this helps! :)
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Re: 2 Positive X-Values in ICE Table
Hi! Usually, if I get two positive values one is considerably more significant than the other and doesn't make sense to use in the equation. But if you have two positive values I would suggest subtracting it from the initial concentration, one of the values should give you an unusable negative value.
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Re: 2 Positive X-Values in ICE Table
Hello. After solving for the quadratic equation, you would usually get a negative and positive value for X and use only the positive value to solve for the equilibrium molar concentrations. However, if you get two positive values for X, plug both X values into the equilibrium concentration equations, and use the X value that will give you positive equilibrium molar concentrations for all reactants and products in the reaction. Hope this helps!
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Re: 2 Positive X-Values in ICE Table
Kiiana Hilario 2E wrote:When using the ICE table to solve for x, if you are given two positive x values, how do you know which one to use?
if you found 2 positive x values, you use the x value that will not give a negative concentration at equilibrium. Typically, one of the positive x values will be very large or just light large enough so when you calculate equilibrium concentration (initial concentration-X) it will be negative which is not realistic. So that's how you choose the x value
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