Question

in a 1x10^-8 M solution of HNO3(aq) at 25C identify the relative molar amounts of these species from least to most

OH- , H2O , HNO3 , H3O+ , NO3-

Answer 1

Ans. # [H₃O⁺] = 1.051 x 10^-7 M                   - see the picture

# [OH^-] = 10^-14 / [H₃O⁺] = 10^-14 / (1.051 x 10^-7) = 9.5147 x 10^-8 M

# [HNO₃] = 0.00 M               because all HNO3 dissociated to form H⁺ and NO₃^-.

# [NO₃^-] = Initial [HNO₃] = 1.00 x 10^-7 M

# [H₂O] = 55.5 M                  as in normal water.