Are the following chemicals light sensitive?
1) Potassium Iodide (KI)
2) Sodium thiosulphate (Na2S2O3)
Personally, I never thought of KI (or NaI) as being light sensitive although I know doped NaI is used to detect gamma rays. However, from what I've been able to read on the Internet, KI does have some sensitivity to light. Sodium thiosulfate apparently does not.
1) Potassium Iodide (KI):
Potassium Iodide is not considered to be light sensitive. It is stable under normal conditions and does not undergo any significant reaction or degradation when exposed to light.
2) Sodium Thiosulphate (Na2S2O3):
Sodium thiosulphate is slightly light-sensitive. When exposed to light, it can undergo a photochemical reaction known as the "tendency to yellow." This is due to the decomposition of thiosulfate ions, resulting in the formation of sulfur and sulfur dioxide. However, the degree of light sensitivity is relatively low, and the reaction is not instantaneous. So, while sodium thiosulphate can be affected by light, it is generally considered to be reasonably stable under normal lighting conditions.
To determine if a chemical is light-sensitive, you can refer to its safety data sheet (SDS) or consult reliable chemical references. However, I can provide you with some general information about the light sensitivity of the chemicals you mentioned:
1) Potassium Iodide (KI):
Potassium Iodide is not typically considered light-sensitive. It is a stable compound commonly used in various applications and is generally not affected by light exposure. However, it is still a good practice to store it in a cool, dry place away from direct sunlight to maintain its quality.
2) Sodium Thiosulfate (Na2S2O3):
Sodium Thiosulfate is also not typically categorized as light-sensitive. It is a stable compound that is widely used in various industries. Similar to Potassium Iodide, it is recommended to store Sodium Thiosulfate in a cool, dry place away from direct sunlight to prevent any potential degradation.
Remember, while these chemicals are generally not light-sensitive, it is always a good idea to refer to specific references or the manufacturer's recommendations for handling and storage precautions.