It is known that  (Pb2+/Pb) = -0.126 2V, Ka (HAc)=1.76×10-5, there is a primary battery: (-) Pb│Pb2+(1mol·L-1)‖H+(1mol·L-1)│H2(1 00kPa),Pt (+)
Question: (1) In the standard state, can the 2H+ + Pb = H2 + Pb2+ reaction occur? (2) If NaAc is added to the H+ solution and the concentration of HAc and Ac- are both 1mol·L-1 after equilibrium, The partial pressure of H2 is 100kPa, does the reaction direction change?