Why pink colour of edta changes to blue at the end point in the edta titration of water using erochrome black-t indicator?

Which city is most likely to be at 13 N. latitude which city is most likely to be at 13 North latitude and 105 longitude? What types of landform was found in the kwakiutl region? What happens to the amount of nitrogen14 as the carbon14 decays? What makes an organism an animal? What advantage do weathter satellities have over ground based weather station? What region has the most elements on the periodic table? How many accidental fires occur? Can human be genetically engineered to have wings? What country has shamrocks? What are the compositon of air pullotion? Effect of conjugation in the frequency of absorption of carbonyl group for cinnamaldehyde and benzaldehyde as compared to n-butyraldehyde? What is a scientific report? What in earth's atmosphere helps most to absorb UVB ultraviolet light from the sun? How did Pasteur solve limiting exposure to air? What is the oxidation of o in k202? Words describing Grasslands? Could there be any advantages to having biases? What type of noun is set? Is erosion and weathering the same thing? What is The number of electrons that neon needs to gain to achieve stability?