Why you add mercuric iodide in starch indicator preparation?

Answer 1

It gives an obvious color change. It's preparation is simple and easy plus it's not harmful or hazardous. When starch is mixed with iodine in water, an intensely colored starch/iodine complex is formed. The complex is very useful for indicating redox titrations that involve iodine because the color change is very sharp. It can also be used as a general redox indicator: when there is excess oxidizing agent, the complex is blue; when there is excess reducing agent the color disappears.

Answer 2

Mercuric iodide is added to starch indicator preparation to act as a color-changing agent. It forms a complex with iodine that creates a blue-black color, indicating the presence of starch in the solution. This helps to visually detect the endpoint of an iodometric titration or the presence of iodine in a solution.

Answer 3

Mercuric iodide is added to starch indicator preparation to enhance its sensitivity and specificity in detecting the presence of iodine. Mercuric iodide forms a complex with iodine, which results in a more distinct color change when iodine is present in the solution being tested. This makes it easier to visually determine the endpoint of a titration or the presence of iodine in a sample. Additionally, mercuric iodide helps stabilize the indicator solution, prolonging its shelf life and maintaining its effectiveness over time.

Answer 4

Well, honey, mercuric iodide is added in starch indicator preparation because it forms a complex with the starch, creating a blue-black color change when exposed to iodine. It helps in visually detecting the presence of starch in a solution, making it a handy tool in chemistry labs. Just be careful with that mercuric stuff, we don't need any accidents now, do we?

Answer 5

Preservative. Starch solution will not grow microorganisms with preservative, Mercuric iodide was used before in food and cosmetic products for that purpose but is less likely used today .