Acetic acid (CH3COOH) contains oxygen, carbon and hydrogen atoms. Lewis structure of acetic acid (CH3COOH) contains 3 C-H bonds, 1 C=O bond, 1 C-O bond, 1 O-H bond and 1 C-C bond. Each oxygen atom has 2 two lone pairs. We will learn how to draw lewis structure of CH3COOH step by step in this tutorial.
Figure of CH3COOH lewis structure is given above and you can see how atoms are made with other atoms. Also, there are no charges on atoms and acetic acid also does not have an overall charge.
There are several steps to draw the lewis structure of CH3COOH. Each step is explained in detail in this tutorial.
There are 3 elements in acetic acid molecule; hydrogen, carbon and oxygen. Hydrogen is a group IA element and has only one electron in its last shell (valence shell). Oxygen is a group VIA element in the periodic table and contains six electrons in its last shell. Carbon atom has 4 electrons in its last shell because it is IV group element. Now we know how many electrons are includes in valence shells of atoms.
Total valance electrons pairs = σ bonds + π bonds + lone pairs at valence shells
Total electron pairs are determined by dividing the number total valence electrons by two. For, CH3COOH, Total pairs of electrons are 12 (24/2) in their valence shells.
To be the center atom, ability of having greater valance and being most electropositive element in the molecule are important facts. These are not essential. But those two facts play a major role in selecting center atom of a molecule.
However, CH3COOH is not a simple molecule with 3, 4 atoms, there are several center atoms in CH3COOH molecule. We know that carbon atom has the highest chance to be center atoms than hydrogen and oxygen atoms because carbon has the highest valence (4) from those 3 elements.
Basic sketch of CH3COOH is given below.
After deciding the center atom and sketch of CH3COOH molecule, we start to mark lone pairs on atoms. Remember that, there are total of 12 electron pairs to mark on atoms as bonds and lone pairs.
There are charges on one oxygen atom and one carbon atom.
Because there is charges on atoms, no need to check that whether charges can be reduced or not. Reducing charges on atoms as a step will give the stable structure. As below, we can reduce charges by converting a lone pair on charged oxygen atoms to a bond.