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?

Water ionizes by the equation h2o(l)⇌h+(aq)+oh−(aq) the extent of the reaction is small in pure water and dilute aqueous solutions. this reaction creates the following relationship between [h+] and [oh−]: kw=[h+][oh−] keep in mind that, like all equilibrium constants, the value of kw changes with temperature.

Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)

The molar mass of nickel(ni) is 58.7 g/mol. how many moles are in an 88 gram sample of nickel?