What is not true about acid-base indicators? A: Acid-base indicators are chemical species themselves.
B: Indicator error occurs when an indicator range doesn't match titration equivalence pH. C: They have different pH values/range of persistent color change.
D: Bromothymol blue can change blue to yellow around pH=7.

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.

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