What is the ph of pure water at 40.0°c if the kw at this temperature is 2.92 a) 6.767 10-14? ob) 0.465 c)7.000 od) 7.233 e) 8.446

Explanation:

As we are given pure water. This means that concentration of hydrogen and hydroxide ions will be the same as pure water is neutral in nature.

Also, value of = .

Relation between and concentration of hydrogen and hydroxide ions is as follows.

Since, = .

So,         =

        =

                      =      

                      =

As we know that pH =

                            pH =

                                   = 6.676

Thus, we can conclude that pH of pure water under given conditions is 6.676.