Dot| Lewis structure of Chromic Acid H2CrO4

Lewis Electron Dot Structure of chromic acid H2CrO4

Lewis Electron Dot Structure of

Chromic Acid H2CrO4

A simple procedure for writing Lewis electron dot structures is given in a previous article entitled “Lewis Structures and the Octet Rule”. Several worked examples relevant to this procedure were given in previous posts please see the Sitemap - Table of Contents (Lewis Electron Dot Structures).

Another example  for writing Lewis structures following the above procedure is given below.

Let us consider the case of the Lewis electron dot structures of chromic acid H2CrO4. Chromic acid is a strong acid and an oxidizing agent. In oxidation reactions, the chromium atom is reduced from the hexavalent to the trivalent state. It is used as an intermediate in chromium plating, as a strong oxidizing agent in organic synthesis, as wood preservative, for the preparation of other chrome chemicals of analytical grade and for the cleaning of laboratory glassware.

 

Step 1: Connect the atoms with single bonds.

 Fig. 1: The chromic acid atoms connected with single bonds

Step 2: Calculate the # of electrons in π bonds (multiple bonds) using  formula (1) in the article entitled “Lewis Structures and the Octet Rule”. 

Where n in this case is 5, excluding the H atoms. Where V = (1 + 6 + 6 + 6+ 6 + 6 + 1) = 32 , V is the number of valence electrons of the molecule.

Therefore, P = 6n + 2 – V = 6 * 5 + 2 – 32  = 0     So, there is no multiple bond in the molecule.

Step 3 & 4: The Lewis resonance structures of chromic acid H2CrO4 are as follows:

Fig. 2: Lewis electron dot structure of H2CrO4

 

Relevant Posts - Relevant Videos

Lewis Structures|Octet Rule: A Simple Method to write Lewis Structures

Lewis| Electron Dot Structure of dichromate Cr2O7-2

 

References

  1. G.N. Lewis, J.A.C.S, 38, 762-785, (1916)
  2. E. C. McGoran, J. Chem. Educ., 68, 19-23 (1991)
  3. A.B.P. Lever, J. Chem. Educ., 49, 819-821, (1972)

 

Key Terms

resonance structures of chromic acid H2CrO4, Lewis electron structures of chromic acid , chemical formula of chromic acid H2CrO4, simple procedure for drawing Lewis structures of chromic acid,

 

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