What is the pH of 10-9 M HCl?
Here , [H+] for acid is < 10 -7 { which is not possible }
so,
total [H+] = 10 -7 + 10 -9
= 1.01 x 10 -7
Thus, pH = - log [H+]
= 6.99
What is meant by Lewis acid and base?
A Lewis acid is any substance, such as the H+ ion, that can accept a pair of nonbonding electrons.
A Lewis base is any substance, such as the OH- ion, that can donate a pair of nonbonding electrons.
Electron pair acceptor are acid and donating are bases.