Suppose you have an indicator that is diprotic and has pKa1 = 3 and pKa2 = 7. If H2In is yellow, HIn- is red, and In2- is blue, what species is/are significantly present at pH of 7? what is the color of the indicator at a pH of 7?

Which of the following describes qualitative data? a) recording the temperature of a solid as it is warmed. b) noting the color of a solution as it is heated. c) measuring the volume of an object by water displacement. d) taking the mass of an object using a balance.

If c + di is a point on the circle, then | c + di |=

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?