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Lecture

CHM110 Experiment 4 Pre-lab questions.docx

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Department
Chemistry
Course
CHM110H5
Professor
Judith C Poe
Semester
Fall

Description
Date: 31 October, 2012 Pre-Lab Questions 1. Trifluoracetic acid will be stronger because it contains fluorine substitutes which are more electronegative than chlorine atoms. This causes a major difference between the electro- negativities of the atoms which results in easy dissociation of hydrogen from the acid to bond with water molecules and form hydronium ions. 2. pK ofAHCN = 9.4 pK Af HF= 3.17 Since HF is a stronger acid than HCN (which can be inferred from the pK ), HF wAll act as the proton donor and HCN will act as a base and accept the protons from HF  ①  ② Adding ① and ② From the lewis structure of HCN, , It can be concluded that the extra proton from Hydronium will attach to the lone pair of electron and establish a bond. 3. Acid-Base indicators are used to detect the equivalence points of a titration. They must be weak acid/base themselves and
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