With this chemistry question:
for 550.0 ml of a buffer solution that is 0.170 m in ch3ch2nh2 and 0.150 m in ch3ch2nh3cl, calculate the initial ph and the final ph after adding 0.020 mol of hcl.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later