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HCl and HI

Posted: Tue Dec 03, 2019 7:08 pm
by Jada Brown 2H
Which is the stronger acid: HI or HCl? Why?

Re: HCl and HI

Posted: Tue Dec 03, 2019 7:10 pm
by Emily Chirila 2E
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 :)

Re: HCl and HI

Posted: Tue Dec 03, 2019 9:51 pm
by BNgo_2L
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.

Re: HCl and HI

Posted: Wed Dec 04, 2019 10:44 am
by Luyan Zhang - 2D
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.

Re: HCl and HI

Posted: Wed Dec 04, 2019 11:39 am
by Abigail Sanders 1E
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.

Re: HCl and HI

Posted: Wed Dec 04, 2019 12:10 pm
by ThomasNguyen_Dis1H
HI, since I has a larger atom radius than Cl, HI has a weaker bond than HCl which makes HI dissociate completely very easily.

Re: HCl and HI

Posted: Wed Dec 04, 2019 1:41 pm
by EricZhao3G
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.

Re: HCl and HI

Posted: Wed Dec 04, 2019 9:36 pm
by AronCainBayot2K
HI is more stronger because chlorine is more electronegative and will have a stronger bond. The weaker the bond the stronger the acid.

Re: HCl and HI

Posted: Wed Dec 04, 2019 9:37 pm
by Sanjana Borle 2K
Is there a periodic trend in terms of this? Does this mean that HF is the weakest acid, then HCl, then HBr, then HI?

Re: HCl and HI

Posted: Wed Dec 04, 2019 9:38 pm
by Micah3J
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?

Re: HCl and HI

Posted: Wed Dec 04, 2019 11:18 pm
by Arvind 4G
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.