Calcium content in water – calcium carboxylate indicator
Thread Content
Does anyone know whether the calcium carboxylate indicators sold generally are pure? I took a look; it is generally used in combination with sodium sulfate or sodium chloride, right? What is the use of adding sodium chloride? If we want to measure the calcium ion content in water, how much calcium carboxylate indicator is needed for 50 ml of water sample?
Calcium carboxylate indicators sold generally are of analytical grade. Due to the instability of its aqueous solution, solid calcium carboxylate indicators are often combined with inert solid sodium chloride to form a (1+100) solid mixture for use, with sodium chloride serving as a \"diluent\". Add about 0.2 g of the prepared indicator to 100 mL of the solution.