HCl vs HF

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Andrea_1H
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HCl vs HF

Postby Andrea_1H » Sun Nov 24, 2019 6:48 pm

Why is HCl a stronger acid than HF?

Jessica Booth 2F
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Re: HCl vs HF

Postby Jessica Booth 2F » Sun Nov 24, 2019 7:02 pm

F is more electronegative than Cl so it is less likely to give off the H+ ion. This means that HCl can disassociate easier, making it the stronger acid.

Catherine Daye 1L
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Re: HCl vs HF

Postby Catherine Daye 1L » Sun Nov 24, 2019 7:07 pm

Because fluorine has a higher electronegativity than chlorine, its bond with hydrogen is stronger. Therefore, HCl dissociates more easily, making it a stronger acid due to its complete ionization.

Isabella Dal Porto 1H
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Re: HCl vs HF

Postby Isabella Dal Porto 1H » Sun Nov 24, 2019 7:08 pm

The hydrogen-chlorine bond in HCl is very weak and it completely dissociates in water. This qualifies HCl as a strong acid. On the other hand, the bonding in HF is relatively strong. Thus, it only partially dissociates in water and makes it a weak acid.

Natalie C 1K
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Re: HCl vs HF

Postby Natalie C 1K » Sun Nov 24, 2019 10:56 pm

the electronegativity of chlorine is less than fluorine, so HCl is the stronger acid, because it can dissociate more easily than HF

Joanne Lee 1J
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Re: HCl vs HF

Postby Joanne Lee 1J » Tue Nov 26, 2019 5:23 pm

The more electronegative an element is, the less acidic it will be when bonded with a hydrogen. Higher acidity molecules will be more likely to give off hydrogen atoms and less electronegative elements are less likely to do so. Therefore, since CL is less electronegative than F, it is more acidic and more likely to give off a hydrogen atom.

Natalie Nartz 4F
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Re: HCl vs HF

Postby Natalie Nartz 4F » Wed Nov 27, 2019 5:39 pm

HCl is a stronger acid than HF. Since the fluorine atom is more electronegative the attraction between H and F will be greater than H and Cl, meaning that HCl will dissociate more likely than HF, making it a stronger acid

WesleyWu_1C
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Re: HCl vs HF

Postby WesleyWu_1C » Wed Nov 27, 2019 11:39 pm

Besides looking at the electronegativity, you can also look at the bond strengths. Since Cl has a larger atomic radius than F, the bond between HCl would be longer than the bond between HF. A longer bond means a weaker bond, so it would be easier for the H to be broken off the HCl than HF. Since it's easier to break off this H on HCl, there would be more dissociation for HCl, which makes HCl be a stronger acid.

chrischyu4a
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Re: HCl vs HF

Postby chrischyu4a » Fri Nov 29, 2019 2:33 am

Chlorine has a larger atomic radius than Fluorine which makes it easier for chlorine to lose its hydrogen atom making it a stronger acid than fluorine.

andrewcj 2C
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Re: HCl vs HF

Postby andrewcj 2C » Fri Nov 29, 2019 3:03 am

Bond strengths is the most-correct reason that HCl is a stronger acid compared to HF. If we only consider electronegativity, we only focus on how strongly F can pull H's electron, which doesn't necessarily imply how easy it is to pull the proton off of HF.

Lauren Tanaka 1A
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Re: HCl vs HF

Postby Lauren Tanaka 1A » Fri Nov 29, 2019 1:55 pm

HCl is a stronger acid than HF because Cl has a larger atomic radius than F therefore the bond between the H and Cl would be longer than in HF. This makes the bond weaker since it is longer making it easier to break the bond between HCl compared to HF. The bond will dissociate more in HCl than in HF making it a stronger acid.

Jasmine Vallarta 2L
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Re: HCl vs HF

Postby Jasmine Vallarta 2L » Fri Nov 29, 2019 2:15 pm

Cl is bigger than F; F is more electronegative

Callum Guo 1H
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Re: HCl vs HF

Postby Callum Guo 1H » Fri Nov 29, 2019 2:32 pm

HCL is a strong acid

KaleenaJezycki_1I
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Re: HCl vs HF

Postby KaleenaJezycki_1I » Fri Nov 29, 2019 2:44 pm

Jessica Booth 4B wrote:F is more electronegative than Cl so it is less likely to give off the H+ ion. This means that HCl can disassociate easier, making it the stronger acid.


This exactly explains why, but in addition HCl is a stronger acid than HF because HCl has a longer/weaker bond between the H and Cl making it easier to donate a H+. Also as the atoms go down the periodic table their size increases causing bond lengths to increase, saying that acidity decreases down the row

Tyler Angtuaco 1G
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Re: HCl vs HF

Postby Tyler Angtuaco 1G » Fri Nov 29, 2019 2:58 pm

HCl has a longer bond between the two atoms, meaning that it is weaker and the H atom is easier to dissociate.

RoshniVarmaDis1K
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Re: HCl vs HF

Postby RoshniVarmaDis1K » Fri Nov 29, 2019 4:06 pm

The HCl bond is longer than the HF bond. This means that it dissociates more easily than the HF bond, so it is a relatively stronger acid.

Edmund Zhi 2B
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Re: HCl vs HF

Postby Edmund Zhi 2B » Fri Nov 29, 2019 9:21 pm

HCl is larger and less electronegative than HF. The bond length is therefore longer and less strong, and easier to dissociate in water, where as the H and F are very tightly bonded in H-F

Alexa Hernandez 3k
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Re: HCl vs HF

Postby Alexa Hernandez 3k » Fri Nov 29, 2019 9:27 pm

CL IS BOTH LARGER AND LESS ELETRONEGATIVE

HuyHa_2H
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Re: HCl vs HF

Postby HuyHa_2H » Sat Nov 30, 2019 7:42 am

Cl is less electronegative than F which makes it easier to dissociate which makes HCl the stronger acid.

anjali41
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Re: HCl vs HF

Postby anjali41 » Sat Nov 30, 2019 10:08 am

HCl is a stronger acid because it is lower on the periodic table, indicating that it is less electronegative and larger. This makes it easier to dissociate, making it a stronger acid. HF for this reason is often not considered a strong acid.


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