Question

H + ion concentration in water at 25 °C​

Answer 1

Answer:

In pure water, at 25C, the [H3O+] and [OH-] ion concentrations are 1.0 x 10-7 M. The value of Kw at 25C is therefore 1.0 x 10-14. Although Kw is defined in terms of the dissociation of water, this equilibrium constant expression is equally valid for solutions of acids and bases dissolved in water.

Explanation:

Answer 2

Answer:

Note- The pH value of the water at 25 degrees Celsius is

p

H

=

7

.

By using the following relation, the concentration of hydronium ion is calculated as,

[

H

+

]

=

10

−

pH

=

10

−

7

mol/L

=

1

×

10

−

7

mol/L

Here, the given concentration of the H plus ion is equal to the calculated value of the concentration of the hydronium ion. So, the given concentration is correct.