Intermediate Topic 169 of 1102 Bonding & Molecular Structure
sp3 Hybridization
One s and three p orbitals mix to form four tetrahedral hybrids, as in methane.
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In-depth explanation of sp3 Hybridization
sp3 hybridization mixes one s orbital and three p orbitals on a central atom to make four equivalent hybrid orbitals. Each hybrid has 25 percent s character and 75 percent p character, and the four point toward the corners of a regular tetrahedron with angles of about 109.5 degrees. The model describes saturated carbon with four single bonds and also nitrogen and oxygen bearing lone pairs, as in ammonia and water. Hybrids of this type form strong sigma bonds that underlie organic chemistry. The 109.5 degree angle is the ideal value for tetrahedral electron geometry.
Going deeper: sp3 Hybridization
Key ideas: Applies to steric number 4: carbon in alkanes, N in NH3 and NH4+, O in H2O, ethers and alcohols. C-H bond from sp3 carbon is about 109 pm and C-C is 154 pm. The more s character, the more electronegative the carbon: sp3 25 percent, sp2 33 percent, sp 50 percent, which also explains acidity of C-H (alkane pKa 50, alkene 44, alkyne 25).
Common mistakes and connections: Do not assume that all four hybrids must have identical bonds if substituents differ, nor that a lone pair must stay unhybridized. Another mistake is claiming that sp3 gives exactly 109.5 degrees in water or ammonia. Links to alkane conformations, rotation about sigma bonds and VSEPR.
Visualization of sp3 Hybridization
Each carbon in ethane is sp3 hybridized, forming four sigma bonds at tetrahedral angles, including the central C-C sigma bond. The interactive lesson shows this as a live animation or chart.
Worked example and use case
Each carbon atom in ethane is sp3 hybridized and bonded to four neighbouring atoms.
Frequently asked questions about sp3 Hybridization
What is sp3 Hybridization?
One s and three p orbitals mix to form four tetrahedral hybrids, as in methane.
Is sp3 Hybridization a beginner, intermediate or advanced topic?
sp3 Hybridization is a intermediate topic in Bonding & Molecular Structure. It builds on the vocabulary of beginner topics in this area.
What should I learn before sp3 Hybridization?
Study these earlier topics in Bonding & Molecular Structure first: Sigma Bond, Pi Bond, Hybridization.
What comes after sp3 Hybridization?
The next topics in Bonding & Molecular Structure are sp2 Hybridization and sp Hybridization.
Can I practise sp3 Hybridization with quizzes?
Yes. The interactive lesson includes a self-check question on sp3 Hybridization, and the Bonding & Molecular Structure quiz draws on every topic in this area.
Where sp3 Hybridization fits in Bonding & Molecular Structure
sp3 Hybridization is topic 54 of 104 in Bonding & Molecular Structure.