Pitt BIOSC 1000 - Biochemistry of Water and Acids (8 pages)

Previewing pages 1, 2, 3 of 8 page document View the full content.
View Full Document

Biochemistry of Water and Acids



Previewing pages 1, 2, 3 of actual document.

View the full content.
View Full Document
View Full Document

Biochemistry of Water and Acids

126 views

This is an indepth look at the chemical characteristics of water, its interacts with other molecules, the pH scale, and acid/base characteristics.


Lecture number:
2
Pages:
8
Type:
Lecture Note
School:
University of Pittsburgh
Course:
Biosc 1000 - Biochemistry

Unformatted text preview:

BIOSC 1000 Lecture 2 Outline of Last Lecture 1 Introduction to the Course 2 Foundations of Biochemistry Outline of Current Lecture 1 Biochemistry of Water 2 The pH scale 3 Acid Strength Current Lecture 1 Biochemistry of Water Structure of Water properties of H2O are unusual for its low molecular weight and simple form this implies that attractive intermolecular forces between H2O molecules are usually strong compared to other similar size molecular compounds o Two covalent O H bonds shared electron pairs in sigma molecular orbits o Two other orbitals hold lone pairs of electrons o O nucleus attracts electrons H nucleus o O is much more electronegative than H o O H bond polarity plus 2 lone pairs of electrons lead to separated partial charges permanent dipole on molecules o charge on O atom and charge on both H atoms o This partial charge separation makes water molecules polar even though the water molecules are net uncharged overall so liquid water sticks together very strongly Hydrogen Bonds unequal charge distribution results in an electrostatic interaction between O atoms of water molecules with H atoms of other water molecules Very weak interactions o Hydrogen bonds are the most stable when O H O is linear when nuclei are in a straight line along both bonds o Each hydrogen bond is relatively weak but numerous H bonds sum to give substantial cohesive properties to liquid water Each H2O molecule can share up to 4 H bonds at once o In ice each H2O is fixed in space in the crystal lattice and each H2O forms H bonds with 4 other H2O molecules so this rigid spacing increases the occupied volume o Liquid water is very dynamic any single H bond is very transient so water molecules exist in flickering clusters o At any given moment liquid water molecules form H bonds with 3 4 other water molecules nearby Each water molecule can donate up to 2 H bonds and accept up to 2 H bonds at any one time On average 3 4 4 for the liquid state and 4 4 in ice o Water is cohesive owing



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Biochemistry of Water and Acids and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Biochemistry of Water and Acids and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?