Solid sodium hydroxide (NaOH) is added to a beaker containing distilled water. Which statement below BEST describes the changes that occur after the addition of NaOH? A. The hydroxyl ion concentration decreases and the pH increases.
B. The hydroxyl ion concentration increases and the pH decreases.
C. The hydronium ion concentration decreases and the pH increases.
D. The hydronium ion concentration increases and the pH decreases.

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.