If a solution of HF (K) 6.8 x 10-4) has a pH of 2.70, calculate the concentration of hydrofluoric acid, Express your answer using two significant figures.

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?