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Ch. 15 - Analytical Techniques: IR, NMR, Mass SpectWorksheetSee all chapters
All Chapters
Ch. 1 - A Review of General Chemistry
Ch. 2 - Molecular Representations
Ch. 3 - Acids and Bases
Ch. 4 - Alkanes and Cycloalkanes
Ch. 5 - Chirality
Ch. 6 - Thermodynamics and Kinetics
Ch. 7 - Substitution Reactions
Ch. 8 - Elimination Reactions
Ch. 9 - Alkenes and Alkynes
Ch. 10 - Addition Reactions
Ch. 11 - Radical Reactions
Ch. 12 - Alcohols, Ethers, Epoxides and Thiols
Ch. 13 - Alcohols and Carbonyl Compounds
Ch. 14 - Synthetic Techniques
Ch. 15 - Analytical Techniques: IR, NMR, Mass Spect
Ch. 16 - Conjugated Systems
Ch. 17 - Aromaticity
Ch. 18 - Reactions of Aromatics: EAS and Beyond
Ch. 19 - Aldehydes and Ketones: Nucleophilic Addition
Ch. 20 - Carboxylic Acid Derivatives: NAS
Ch. 21 - Enolate Chemistry: Reactions at the Alpha-Carbon
Ch. 22 - Condensation Chemistry
Ch. 23 - Amines
Ch. 24 - Carbohydrates
Ch. 25 - Phenols
Ch. 26 - Amino Acids, Peptides, and Proteins
Ch. 26 - Transition Metals
Purpose of Analytical Techniques
Infrared Spectroscopy
Infrared Spectroscopy Table
IR Spect: Drawing Spectra
IR Spect: Extra Practice
NMR Spectroscopy
1H NMR: Number of Signals
1H NMR: Q-Test
1H NMR: E/Z Diastereoisomerism
H NMR Table
1H NMR: Spin-Splitting (N + 1) Rule
1H NMR: Spin-Splitting Simple Tree Diagrams
1H NMR: Spin-Splitting Complex Tree Diagrams
1H NMR: Spin-Splitting Patterns
NMR Integration
NMR Practice
Carbon NMR
Structure Determination without Mass Spect
Mass Spectrometry
Mass Spect: Fragmentation
Mass Spect: Isotopes

Concept #1: Equipment and Theory

Concept #2: How to Read a Mass Spectrum


So the base peak of the sample is simply going to be the tallest peak out of all of them and we always scale the base peak to be 100, so that means that we make our base peak 100 and then we compare everything else to that, okay? Now, in this case my base peak happened to be my molecular ion, right? The m plus radical, okay? But, this isn't always the case later on when we talk about fragmentation, what we'll see is that sometimes the base peak is actually going to be one of the fragments because sometimes the fragments are more stable than the molecular ion themselves. So, in this case I gave you a simple situation where the base peak is actually equal to the molecular ion but we're going to see later on is that sometimes one of the smaller fragments is actually your base peak and your molecular ion is lower because it's more common that it fragments than that it doesn't, does that making sense? Awesome guys, so this is just an intro. Now, what we're going to do is we're going to go more into fragmentation patterns and we're going to talk about isotopes, okay? By the way, I want to point out one thing, which is that notice that there is a tiny peak at 17 that I didn't talk about, how did that happen? does that mean it has one extra hydrogen, will get there, okay? That's its own kind of phenomenon but for right now just focus on 16 and below because that's what we can understand through the process of ionization. Alright, so let's move on to the next video.