When the pH is above a molecule's pka, the compound will be deprotonated.
Higher pka will signify, more the compound's or acid's affinity to retains its protons . While lesser pka signifies, lesser the compound's or acid's affinity to retains its protons, that is acid can easily loose its protons or get deprotonated. and low pH means, more proton concentration when pH approaches pka, the compound begins to dissociate and when it becomes higher than pH then the compound looses its protons. So, when the pH is above a molecule's pka, the compound will be deprotonated.