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In today's lecture (Dec 2nd), Dr. Lavelle was comparing the strength of two strong acids: HBr and HCl. Is an acid with a weaker bond (which in this case is HBr, since it is larger) a stronger acid because it can give away a H+ to form H3O+ more easily? I was confused whether HCl or HBr was the stronger acid. Thanks in advance!
Hi, you're right that HBr is a stronger acid than HCl, because it has a weaker bond so it dissociates more easily, causing it to give off more H+ ions in the solution. In the scheme of all acids though, I think both HBr and HCl are considered strong.
HBr is the stronger acid. Since Br is larger than Cl the bond length of HBr is larger making it a weaker bond. This allows the bond to break much easier and therefore it can more easily donate H+ compared to HCl.
Yes, you're right, since Br is a bigger atom, it is farther away from H, making the bond length longer, and thus creating a weaker bond. Since it is a weaker bond, it is easier to dissociate the molecule and create hydronium ions.
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