Water hardness is a critical parameter in various applications, from industrial processes to household water quality. Understanding and accurately measuring the concentration of calcium and magnesium ions, the primary contributors to water hardness, is essential. In the realm of analytical chemistry, Eriochrome Black T (CAS 1787-61-7) stands out as a key player, particularly as a complexometric indicator in EDTA titrations for this very purpose.

Eriochrome Black T, also known by its synonym Mordant Black 11, is a highly effective indicator that undergoes a distinct color change, signaling the endpoint of a titration. When used in the determination of water hardness, it forms a stable, wine-red complex with calcium and magnesium ions at a pH of approximately 10 (typically buffered with ammonia-ammonium chloride). As ethylenediaminetetraacetic acid (EDTA), a powerful chelating agent, is added, it sequentially binds with the metal ions. At the precise endpoint, when all metal ions have been complexed by EDTA, the Eriochrome Black T is released from the metal ions, and its color abruptly shifts to a bright blue. This clear visual cue allows chemists and technicians to accurately determine the total concentration of these hardness-causing ions.

The reliability and sharp endpoint provided by Eriochrome Black T make it a preferred choice for both routine water quality testing and more rigorous analytical procedures. Its application extends beyond just water hardness; it is also crucial for determining the presence and concentration of various other metal ions like barium, cadmium, zinc, and lead. For laboratories and industries that rely on precise measurements, sourcing high-quality Eriochrome Black T is paramount. As a leading manufacturer in China, NINGBO INNO PHARMCHEM CO.,LTD. is dedicated to providing consistently pure and effective Eriochrome Black T (CAS 1787-61-7). We understand the importance of a stable supply chain for critical reagents, and we offer competitive prices for this essential analytical reagent.

When you buy Eriochrome Black T from us, you are investing in accuracy and reliability. Our commitment to quality ensures that you receive a product that will deliver sharp endpoints and dependable results for your water analysis and metal determination needs. If you are looking for a trusted supplier of Mordant Black 11, we encourage you to contact us for a quote and to learn more about how our products can support your laboratory's requirements.