Please help me Calculate the pH of a 7.75x10^-12 M Hydrobromic acid solution. Ph=(round to 4sig figs). The solution is?(acidic/basic)

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.