Why does the pink color, which forms at the point where naoh comes into contact with the solution (hcl) in the flask, disappear more slowly near the endpoint?

b. atoms in metallic solids are not arranged in a regular pattern

explanation:

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.