DCPIP is a redox dye that starts off blue but will turn reddish-pink in acidic solution.
This chemical is often used in general chemistry experiments with vitamin C (ascorbic acid), which is a good reducing agent. The DCPIP become colorless when it is reduced (remember, it's blue when oxidized).
Element? I'm quite not sure but...Hope this helps!
It has a positive charge, 22-18= +4
Because they help regulate the marine environment.
The scientific evidence that scientists use in supporting or critiquing the conclusions of experiments usually consists observations based on large sample sizes.