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Hedwigeeeee
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#1
why when we calculate the standard enthalpy of neutralisation, we should use -Q/n, which n is the amount of acid , why not base?
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Mad_Dog_Graveson
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Hedwigeeeee
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#3
(Original post by Mad_Dog_Graveson)
Mix Francium with Hydrochloric Acid
Mix Francium with Hydrochloric Acid
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Pigster
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#4
(Original post by Wuxinyu)
why when we calculate the standard enthalpy of neutralisation, we should use -Q/n, which n is the amount of acid , why not base?
why when we calculate the standard enthalpy of neutralisation, we should use -Q/n, which n is the amount of acid , why not base?
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Kian Stevens
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#5
(Original post by Wuxinyu)
why when we calculate the standard enthalpy of neutralisation, we should use -Q/n, which n is the amount of acid , why not base?
why when we calculate the standard enthalpy of neutralisation, we should use -Q/n, which n is the amount of acid , why not base?
H2OThus, depending on what the limiting reagent is, the moles of acid or base will be equivalent to the moles of water produced; thus, n is the moles of water produced as Pigster said, and this is because the enthalpy of neutralisation is defined in terms of the water produced
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Hedwigeeeee
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#6
(Original post by Kian Stevens)
Consider that in any acid-base neutralisation, H+ + OH- H2O
Thus, depending on what the limiting reagent is, the moles of acid or base will be equivalent to the moles of water produced; thus, n is the moles of water produced as Pigster said, and this is because the enthalpy of neutralisation is defined in terms of the water produced
Consider that in any acid-base neutralisation, H+ + OH-
H2OThus, depending on what the limiting reagent is, the moles of acid or base will be equivalent to the moles of water produced; thus, n is the moles of water produced as Pigster said, and this is because the enthalpy of neutralisation is defined in terms of the water produced
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Kian Stevens
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#7
(Original post by Wuxinyu)
but when the amount of acid and base are not equal, they are not equivalent to the amount of water produced, the question in the attachment does not have the same volume of HCL and NaOH. they used the amount of base, which made me confused.
but when the amount of acid and base are not equal, they are not equivalent to the amount of water produced, the question in the attachment does not have the same volume of HCL and NaOH. they used the amount of base, which made me confused.
So, like I said, this is dictated by what the limiting reagent is; you don't always use the moles of acid, as the limiting reagent could be base, and based on the neutralisation ionic equation I stated earlier the moles of limiting reagent used will equal the moles of water produced... This is what you use as n
Last edited by Kian Stevens; 2 years ago
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Hedwigeeeee
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#8
(Original post by Kian Stevens)
Question 1b even states that you have to calculate the enthalpy change per mole of water produced, so this gives you a hint anyway as this is what the enthalpy change of neutralisation is essentially measured in; don't forget that the enthalpy change of neutralisation is defined as the enthalpy change of an acid-base reaction which produces one mole of water
So, like I said, this is dictated by what the limiting reagent is; you don't always use the moles of acid, as the limiting reagent could be base, and based on the neutralisation ionic equation I stated earlier the moles of limiting reagent used will equal the moles of water produced... This is what you use as n
Question 1b even states that you have to calculate the enthalpy change per mole of water produced, so this gives you a hint anyway as this is what the enthalpy change of neutralisation is essentially measured in; don't forget that the enthalpy change of neutralisation is defined as the enthalpy change of an acid-base reaction which produces one mole of water
So, like I said, this is dictated by what the limiting reagent is; you don't always use the moles of acid, as the limiting reagent could be base, and based on the neutralisation ionic equation I stated earlier the moles of limiting reagent used will equal the moles of water produced... This is what you use as n
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