Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Ligand

Ligand formula or common name, such as Cl-, H2O, ammonia, or CN-.

Find a ligand's position in an abbreviated spectrochemical series ordered from weak-field to strong-field ligands. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Weak-to-strong rank

One-based position from weakest to strongest field.

Ligand notation

Canonical ligand notation used in the series.

• The result is conditional on the stated model, constants, standard state, temperature, pressure, composition, and unit basis. Real mixtures and measurements can depart from ideal behavior and carry uncertainty not represented by a single calculated value.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Buffer pH After Addition

  Compute the buffer pH after adding strong base as pKa plus log10 of conjugate base over remaining weak acid.

• Crystal Field Stabilization Energy Calculator

  Compute the octahedral crystal field stabilization energy in units of the ligand field splitting Delta-o from the t2g and eg electron counts: CFSE = (-0.4*n(t2g) + 0.6*n(eg)) * Delta-o.

• Octahedral Jahn-Teller Distortion Checker

  Check whether an octahedral complex has uneven e_g occupancy and therefore a strong Jahn-Teller distortion; t2g-only weak distortions are outside this check.