How to Calculate LC-MS Adduct m/z
Learn how neutral exact mass is converted into common ions such as [M+H]+, [M+Na]+, [M+NH4]+, [M−H]−, and dimer ions.
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UVX Chem
Free LC-MS and Chemistry Tools
Analytical Chemistry Materials Science Photochemistry
Calculate exact mass and LC-MS adducts, extract m/z values from mass-spectrum images, explore oligomer patterns, analyze SMILES structures, and estimate UV and solvent behavior—all directly in your browser.
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Exact Mass & DBE
Formula Calculator
Mass-Spectrum OCR
LC-MS Adduct Matrix
SMILES Analysis
UV Predictor
Oligomer Finder
Solvent Compatibility
Chemical Structure Editor
Photoinitiator Database
UV Spectra Library
Positive & Negative Ions
Chemistry Guides
Learn LC-MS and Chemical Analysis
Practical explanations of the calculations and scientific concepts behind the UVX Chem tools.
How to Identify an Adduct from an Observed m/z
Assign a possible adduct to an experimental peak, estimate the neutral molecular mass, and calculate related ions.
How to Predict Common LC-MS Adducts
Explore how molecular structure, ionization polarity, and mobile-phase additives influence likely adduct formation.
How to Estimate UV Absorption from SMILES
Understand how aromatic rings, conjugation, carbonyl groups, and heteroatoms affect UV detectability and absorption range.
How to Calculate DBE from a Molecular Formula
Use double-bond equivalents to evaluate rings, multiple bonds, unsaturation, and molecular-formula plausibility.
How to Generate SMILES from a Chemical Structure
Draw a chemical structure and generate its SMILES notation for molecular-property calculations, structure analysis, and chemical database searches.
How to Find Oligomer Repeat Units
Analyze measured m/z values for repeat units, homologous series, monomers, dimers, and possible oligomer patterns.
How to Select a Solvent for Chemical Extraction
Compare solvent compatibility, polarity, and predicted partition behavior for analytical sample preparation.
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