Complexometric Titration Calculator

Precise Metal Ion Analysis with EDTA

ChemistryCalculatorHub.info

Metal Ion Concentration Calculator

Calculate metal ion concentration from EDTA titration data.

Results will appear here

Conditional Stability Constant Calculator

Calculate conditional stability constant at specific pH.

Results will appear here

Masking Effect Calculator

Calculate the effectiveness of masking agents.

Results will appear here

Understanding Complexometric Titration

EDTA Chemistry

Key aspects of EDTA titrations:

  • Hexadentate ligand structure
  • 1:1 metal-EDTA complexes
  • pH-dependent stability
  • Multiple protonation states
  • Chelate effect importance

Indicators and Endpoints

Common metallochromic indicators:

  • Eriochrome Black T:
    • Ca²⁺, Mg²⁺ determination
    • Wine red to blue transition
  • Murexide:
    • Ca²⁺, Ni²⁺ determination
    • Pink to purple transition

Method Requirements

For accurate results:

  • Proper pH control
  • Indicator selection
  • Masking interfering ions
  • Buffer composition
  • Temperature control

Applications

Common applications include:

  • Water hardness determination
  • Metal ion analysis
  • Industrial quality control
  • Environmental monitoring
  • Pharmaceutical analysis

Essential Complexometric Formulas

Metal Ion Concentration

[M] = (VEDTA × MEDTA) / Vsample

Where:

V = Volume

M = Molarity

Conditional Constant

K'f = Kf / α

Where:

Kf = Formation constant

α = Side reaction coefficient

Masking Effect

log α = log(1 + K[L])

Where:

K = Formation constant

[L] = Ligand concentration