Answer (A) H2O → H+ + OH− (donates H+ , Bronsted acid) H2O + H+ → H3O+ (Bronsted base, accept H+) H2O : + H+ → [H2O:→H]+ (Lewis base) Water at 60°C must have pH less than 7. So asample shows pH = 7, so it must be basic in natureand turns red litmus blue N1V1 = N2V2 0.1 V = N2 (100 V) N2 = 10−3 pH = 3 So pH changes by 2 units, (not changes to 2 unit)