Which of the following conditions indicate an acidic solution at 25°C
A pH = 3.04
B [H+] > 1.0 x 10^-7 M
C pOH = 4.51
D [OH-] = 3.21 x 10^-12 M

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An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Which is the solubility product expression for caf2(s)?  [ca2+]/[f–]2  [ca2+][f2–]  [ca]+[f]2  [ca2+][f–]2