Chemical Name ⇄ Formula Calculator
Convert between a chemical name and its formula. Supports ionic, covalent, acid, hydrate, polyatomic ion, straight-chain organic, and common coordination compound naming patterns — with step-by-step reasoning, a simplified structure diagram, an animated charge-balance walkthrough, and an interactive periodic table for building formulas.
Background
Naming depends on compound class. Ionic names use cation + anion and Roman numerals for variable-charge metals. Covalent names use Greek prefixes. Acids, hydrates, simple organics, and a handful of classic coordination compounds each follow their own patterns, so the calculator shows how it classified the input instead of only returning an answer.
How to use this calculator
- Input: Type either a chemical name or a formula, or build a formula element-by-element with the periodic table picker. The calculator detects direction automatically.
- Use Roman numerals: For variable-charge metals, use names like iron(III), copper(II), or tin(IV).
- Look at the diagram and animation: For many compounds you'll see a simplified structure sketch and, for ionic compounds, an animated crisscross charge-balance walkthrough.
- Review confidence: If the calculator marks an answer as “Check,” verify it against your class rules.
Formula & Equation Used
Ionic: cation + anion; subscripts balance total positive and negative charge (the crisscross method).
Covalent: Greek prefixes give atom counts, with no mono- on the first element.
Acids: binary acids use hydro-...-ic acid; oxoacids follow ate → ic and ite → ous.
Hydrates: a water count after the dot becomes hemi-, mono-, sesqui-, di-, tri-...-hydrate, etc.
Organic (alkanes): straight-chain CnH(2n+2) uses meth-, eth-, prop-, but-, pent-...-ane.
Frequently Asked Questions
Q: Why might a chemical naming result be marked “Check”?
Some compounds are ambiguous without oxidation state, structure, or course-specific naming rules. Transition metals and compounds with three or more different elements are the most common cases.
Q: How accurate is the structure diagram?
It's a simplified schematic meant to build intuition — showing a central atom, its bonded neighbors, and, for ions, an approximate charge — not a rigorous VSEPR/3D-accurate structure. Always check a structural chemistry reference for exact geometry.
Q: Does this handle coordination compounds and organic chemistry?
It recognizes a curated list of common textbook coordination compounds (like hexaamminecobalt(III) chloride) by name, and straight-chain alkanes (methane through decane) — but it isn't a general ligand-nomenclature engine or organic-chemistry namer, so unfamiliar complex ions, branched chains, or functional groups won't be recognized yet.
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