For the next question consider an indicator which is blue when in the acid form and pink in the basic form. at ph 6.5 the [blue] = 0.00015 m and [pink] = 0.01 m. what is the color of the solution?

In this item, we are given that the color of the indicator changes depending on the acidity or generally, the pH of the solution to which it is exposed. In this item, the pH is equal to 6.5. Solutions with pH that are lower than 7 are acidic, those with pH higher than 7 are basic and those with exactly 7 are neutral. Hence, the color of the indicator should be blue given that the solution is acidic. 

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.