Eriochrome Black T indicator (CAS 1787-61-7), also known as Mordant Black 11 or Elektrochrome Black T indicator, is a versatile metal ion indicator used in complexometric titrations. The chemical name is 1-(1-hydroxy-2-naphthylazo)-6-nitro-2-naphthol-4-sulfonate sodium salt.
Product Specifications
Product Name
Eriochrome Black T
CAS Number
1787-61-7
Molecular Formula
C20H12N3NaO7S
Molecular Weight
461.38
EINECS
217-250-3
Appearance
Black powder
Applications
Comprehensive indicator for determining barium, cadmium, indium, magnesium, manganese, calcium, lead, scandium, strontium, zinc, zirconium, and other metal ions
Primary indicator for EDTA complexometric titration, particularly suitable as an indicator for magnesium
Used as an indicator when determining total hardness (total calcium and magnesium ions) of water samples
Typically mixed with KCl or NaCl to form solid mixtures due to poor aqueous solution stability
Frequently Asked Questions
Can I get some samples?
Yes, sample orders are available for quality checks and market testing. The customer is responsible for sample and express costs.
Do you accept customized orders?
Yes, we welcome ODM & OEM requests.
What's the lead time?
Lead time depends on order quantity. Small orders typically require 3-5 days, while larger orders require negotiation.
What are your warranty terms?
We offer a 12-month warranty period.
What payment methods do you accept?
We accept Escrow, T/T, Western Union, Cash, and other payment methods.
