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Why is the standard enthalpy change of neutralization between hydrofluoric acid and sodium hydroxide more negative than usual?
Wiki User
∙ 16y ago
Because of high of heat of Hydration of HF ( Fluoride ion is extensively hydrated because of it's small size )
Wiki User
∙ 16y ago
Wiki User
∙ 14y agoHF has greater enthalpy of neutralization due to very high enthalpy of hydration of fluoride ion
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What does calcium carbonate and aluminum hydroxide help neutralize?
SINCE CARBONATE & HYDROXIDE'S ARE NEGATIVE ELEMENTS(eg..OH-) WHEN USED WITH ACIDIC (pH<7)ENVIRONMENT (i.e..POSITIVE ELEMENTS( H+))FORMS A NEUTRAL COMPOUND.HENCE USED FOR NEUTRALIZATION.
A solution containing equal numbers of hydrogen ions and hydroxide ions is called what?
Technically it is called water because the positive hydrogen ions and the negative hydroxide ions would attract to form a compound with two hydrogen molecules and one oxygen molecule. H2O. This occurs most often in acid-base neutralization reaction where water is a product of the reactions.
Hydroxide positive or negative?
I think it is a positive charge!!
What is true of hydroxide ions?
They have a negative charge and the formula OH.
Which of the following polyatomic ions have the same charge as the hydroxide ion?
Nitrate (NO3^-), because the Hydroxide ion also has a negative one charge (OH^-)
What does the negative sign on the value of an enthalpy of formation indicate?
A negative enthalpy of formation indicates that energy is evolved.
What does calcium carbonate and aluminum hydroxide help neutralize?
SINCE CARBONATE & HYDROXIDE'S ARE NEGATIVE ELEMENTS(eg..OH-) WHEN USED WITH ACIDIC (pH<7)ENVIRONMENT (i.e..POSITIVE ELEMENTS( H+))FORMS A NEUTRAL COMPOUND.HENCE USED FOR NEUTRALIZATION.
Is polymerization endothermic or exothermic?
Exothermic, because the reaction enthalpy must be negative. With polymerization, the entropy decreases. The Gibbs energy has to be negative. Thus negative reaction enthalpy. Gibbs energy = reaction enthalpy - temperature*entropy
What are two things produced by neutralization?
Two things produced by neutralization are water and a salt. Water is formed as a result of the reaction between the hydrogen ions from an acid and the hydroxide ions from a base. A salt, which is an ionic compound, is formed when the positive ions from the base combine with the negative ions from the acid.
Does Ice melting have a positive or negative enthalpy?
Negtive
Do hydroxide atoms have a negative charge?
The hydroxide ion, OH-, has a negative charge of 1-.
Does hydroxide ions have a negative charge?
Yes, hydroxide (OH-) ions have a negative electrical charge.
Why is the enthalpy change of neutralisation equal to -57.2kJ mol-1?
Actually your question should sound "Why is the enthalpy change of neutralization of STRONG ACID and STRONG BASE equal to -57.2kJmol-1?". This is because when STRONG ACID and STRONG BASE react and neutralization process occur, a complete ionization will occur. Therefore, they will have almost the same value of enthalpies and can be assummed to be -57.2kJmol-1. As per mentioned that if your question sounds "Why is the enthalpy change of neutralization of STRONG ACID and STRONG BASE equal to -57.2kJmol-1?", then my explaination above will be helpful. However, if it doesn't sound like mine and you insisted with your question titled "Why is the enthalpy change of neutralization equal to -57.2kJmol-1", then my answer is that they didn't equal to -57.2kJmol-1 and it varies from the list of reactants. 1. STRONG acid + STRONG base = -57.2 2. WEAK acid + WEAK base = less than 57.3kJmol-1 3. WEAK acid + STRONG base = more negative than -57.3kJmol-1 Wish that it is useful as your reference. Prompt me if I am wrong.
Predict whether the changes in enthalpy entropy and free energy will be positive or negative for the freezing of water and explain your predictions How does temperature affect the spontaneity?
Enthalpy- positive Entropy- decreasing Free energy- negative
What is the difference between electron affinity and electron gain enthalpy?
electron affinity is the negative of electron gain enthalpy. for example, the electron gain enthalpy of fluorine is -328, and electron affinity is 328 which is -(-328)
What does OH negative stand for?
hydroxide
What could make Delta become negative at a given enthalpy and entropy?
The equation for ∆G is ∆G = ∆H - T∆S H is enthalpy and S is entropySo, ∆G is negative if T∆S is greater than ∆H
