The dye phenol red has a color of yellow at pH 6.8 and bright red at pH 8.0; is phenol red a suitable indicator for the titration of HCI (hydrochloric acid) by NaOH (sodium hydroxide)?

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

What is the wavelength of a 3*10^12 hz infrared wave a 3*10^20m b 1* 10^4m c 3*10^-3m d 1*10^-4 m

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.