A simple method for drawing Lewis structures: Carbonic Acid
A simple method for writing Lewis structures (electron Lewis dot structures) was given in a previous post entitled “Lewis Structures and the Octet Rule”.
Several worked examples relevant to this procedure were given in previous posts please see the post entitled "Lewis Structures & the Octet Rule - Theory & Examples"
Let us examine the case of carbonic acid H_{2}CO_{3}. How can we draw the carbonic acid Lewis dot structure?
Step 1: Connect the atoms with single bonds.
Fig. 1 : Connect the atoms of carbonic acid with single bonds |
Step 2: Calculate the # of electrons in π bonds (multiple bonds) using formula (1):
Where n in this case is 4 since H_{2}CO_{3 }consists of six atoms but two of them are H atoms.
Where V = (1 + 6 + 4 + 6 + 6 + 1) = 24
Therefore, P = 6n + 2 – V = 6 * 4 + 2 – 24 = 2 So there are 2 π electrons in H_{2}CO_{3}and therefore 1 double bond must be added to the structure of Step 1.
Step 3 & 4: The Lewis structure of H_{2}CO_{3 }is derived below:
Fig. 2: Lewis structure of carbonic acid H_{2}CO_{3} |
For a detailed description of the above method please see the following video:
Relevant Posts
Lewis Structures and the Octet Rule - A simple method to write Lewis Structures
Simple method for writing Lewis Structures – Ozone O_{3} and carbonate CO_{3}^{-2} ion
Lewis dot structures - Electron dot structure of CO
Simple Method for drawing Lewis structures (Video): H2CO3
References
- G.N. Lewis, J.A.C.S, 38, 762-785, (1916)
- E. C. McGoran, J. Chem. Educ., 68, 19-23 (1991)
- A.B.P. Lever, J. Chem. Educ., 49, 819-821, (1972)
Key Terms
electron dot Lewis structures, Lewis Structures and the Octet Rule, how can we draw the carbonic acid Lewis dot structure
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