HCl and HI

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Jada Brown 2H
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HCl and HI

Postby Jada Brown 2H » Tue Dec 03, 2019 7:08 pm

Which is the stronger acid: HI or HCl? Why?

Emily Chirila 2E
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Joined: Sat Jul 20, 2019 12:16 am

Re: HCl and HI

Postby Emily Chirila 2E » Tue Dec 03, 2019 7:10 pm

HI is the stronger acid because the chlorine in HCL is more electronegative than the I in HI. The chlorine pulls in the electrons more and creates a stronger bond that is harder to break. Remember the stronger acid will have the weaker bond-- and strong acids fully dissociate :)

BNgo_2L
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Joined: Wed Sep 11, 2019 12:17 am

Re: HCl and HI

Postby BNgo_2L » Tue Dec 03, 2019 9:51 pm

Strong acids tend to have weaker bonds because when bonds are more easily broken, protons are more easily given off, which is a characteristic of strong acids.

Luyan Zhang - 2D
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Joined: Sat Jul 20, 2019 12:16 am

Re: HCl and HI

Postby Luyan Zhang - 2D » Wed Dec 04, 2019 10:44 am

HI is stronger because Iodine is a larger atom, and therefore the atomic radius is larger. Because the radius is larger, the bond between them is longer and weaker, and H+ is easily lost to surrounding solution.

Abigail Sanders 1E
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Joined: Wed Sep 11, 2019 12:16 am

Re: HCl and HI

Postby Abigail Sanders 1E » Wed Dec 04, 2019 11:39 am

HI is the stronger acid as there is a weaker bond between HI than there is between HCl. This is due to both the atomic radius and the size of I vs Cl. Because I has a greater number of electrons, there is less nuclear charge felt at its valence electrons so, the HI bond is weaker and easier to break. Because the bond is easier to break it is a stronger acid as it will dissociate more easily.

ThomasNguyen_Dis1H
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Joined: Fri Aug 30, 2019 12:17 am

Re: HCl and HI

Postby ThomasNguyen_Dis1H » Wed Dec 04, 2019 12:10 pm

HI, since I has a larger atom radius than Cl, HI has a weaker bond than HCl which makes HI dissociate completely very easily.

EricZhao3G
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Joined: Tue Oct 08, 2019 12:16 am

Re: HCl and HI

Postby EricZhao3G » Wed Dec 04, 2019 1:41 pm

HI is a stronger acid because it has a longer bond length so its bond is weaker, thus it is easier for the bond to be broken to donate the H+ compared to HCl.

AronCainBayot2K
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Re: HCl and HI

Postby AronCainBayot2K » Wed Dec 04, 2019 9:36 pm

HI is more stronger because chlorine is more electronegative and will have a stronger bond. The weaker the bond the stronger the acid.

Sanjana Borle 2K
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Joined: Fri Aug 09, 2019 12:15 am

Re: HCl and HI

Postby Sanjana Borle 2K » Wed Dec 04, 2019 9:37 pm

Is there a periodic trend in terms of this? Does this mean that HF is the weakest acid, then HCl, then HBr, then HI?

Micah3J
Posts: 100
Joined: Tue Oct 08, 2019 12:16 am

Re: HCl and HI

Postby Micah3J » Wed Dec 04, 2019 9:38 pm

AronCainBayot1L wrote:HI is more stronger because chlorine is more electronegative and will have a stronger bond. The weaker the bond the stronger the acid.

And this also means that the stronger the bond the stronger the base right?

Arvind 4G
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Re: HCl and HI

Postby Arvind 4G » Wed Dec 04, 2019 11:18 pm

HI is stronger because the H-Cl bond is stronger than the H-I bond. A stronger acid needs to have weak bonds that are easily broken which allows H+ ions into solution.


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