HI is the weaker acid.
The bond strength of an acid is typically influenced by the size of the "Br" atom; the smaller the "Br" atom, the stronger the H-A bond. The atoms get bigger and the bonds get weaker as you proceed down a row in the Periodic Table, strengthening the acids.
An acid is a molecule or ion having the capacity to donate a proton (a Brnsted-Lowry acid) or establish a covalent bond with an electron pair (a Lewis acid). The first class of acids are known as proton donors, or Brnsted-Lowry acids.
The chemical name for the substance is lysergic acid diethylamide, or LSD as it is more often known. Use of it may lead to distorted perceptions of reality and objects due to its potent hallucinogenic effect. LSD's effects are referred to as tripping.
While "acid" technically only relates to the solute in the definition, it is frequently used to designate aqueous solutions of acids that have a pH lower than 8.
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