text: which of these has the lowest concentration of hydrogen ions: 0.1 m hcl, 0.1 m naoh, 0.1m h2so4, pure water? e which of these has the lowest concentration of hydrogen ions: 0.1 m hcl, 0.1 m naoh, 0.1m h2so4, pure water? explain your answer. 0.1 m naoh.  naoh is a strong base while water is neutral and the others are strong acids.