Explain the reasons behind common laboratory practices: why lab coats are white, why acids are stored in dark bottles, and why titrations use white tiles.

Here are the answers to your questions:

1. Lab coats are typically white because white fabric makes it easy to spot spills or contamination, indicating when the coat needs cleaning. White also reflects heat, helping to keep the wearer cool, and it symbolizes cleanliness and professionalism in a scientific setting.

2. Acids, especially those that are light-sensitive (like nitric acid), are stored in dark glass bottles to prevent decomposition or degradation caused by exposure to light. The dark glass blocks ultraviolet and visible light, preserving the acid's stability and concentration over time.

3. Solutions in conical flasks are placed on white tiles during titrations to make the color change of the indicator more visible and distinct. The white background provides a clear contrast, allowing the chemist to accurately determine the endpoint of the titration.