CHEM 14C Study Guide - Final Guide: Acid Dissociation Constant, Erwin Chargaff, Prostaglandin
28 Feb 2018
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Q: which is the strongest acid? (hf, hcl, hbr, hi) A: hi: acid strength increases down the column, because atom size increases down the column, bigger atoms overlap less well with hydrogen"s s orbital, so have weaker bond strength, so react more easily, so make stronger acids. Physical properties (boiling points, solubility) and chemical properties (reactivity) influence biological properties. Hydrogen atom (proton) transfer common step in enzyme reactions. Hcl donates proton (h atom without electrons) Mechanism: reaction mechanism: step-by-step description of bond changes, use arrows to push electrons from source to destination. The diagram shows lone pair pushed off base and attacks acid. Electrons from the bond go to cl atom. Label acid, base, conjugate acid & conjugate base: can be one step or several steps. Electron poor, has positive or partial positive charge ( +) Has open octet to be attacked by electrons. Lewis acid (some br nsted acids can be lewis acids; lewis acids are not always.
