Ascientist working in a lab wants to determine the approximate ph of a filtered biological solution using a visual test. which tool should the scientist use to measure ph?

An aqueous solution of hydroiodic acid is standardized by titration with a 0.186 m solution of calcium hydroxide. if 26.5 ml of base are required to neutralize 20.3 ml of the acid, what is the molarity of the hydroiodic acid solution? m hydroiodic acid

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false