A 0.1 molar solution of nitrous acid is 7.1 percent ionised at equilibrium what is the
A. Concentration Hydrogen ion and ph
B. Ka value of nitrous acid
A. The concentration of hydrogen ion in a 0.1 molar solution of nitrous acid is 7.1 x 10^-3 moles/L and the pH is 2.15.
B. The Ka value of nitrous acid is 7.1 x 10^-4.
A is right.
B is incorrect.
See your other post for the correct values for A, B, C.