Question

Calculate the value of [H3O+] from the given [OH-] and lable the solution as acidic or basic.

A. 10^-2 M

B. 4.0 x 10^-8 M

C. 6.2 x 10^-7 M

D. 8.5 X 10^-13 M

Answer 1

Ans :

If the value of [H3O+] is more than 10^-7 M , the solution is acidic , and if it is less than 10^-7 it is basic.

So here :

A)

[OH^-] = 10^-2 M

[H3O⁺] = (1.0 x 10^-14) / 10^-2

= 10^-12 M

So the solution is basic

B)

[OH^-] = 4.0 x 10^-8 M

[H3O⁺] = (1.0 x 10^-14) / (4.0 x 10^-8)

= 2.5 x 10^-7

So the solution is acidic

C)

[OH-] = 6.2 x 10^-7 M

[H3O+] = (1.0 x 10^-14) / (6.2 x 10^-7)

= 1.6 x 10^-8

So the solution is basic.

D)

[OH-] = 8.5 x 10^-13 M

[H3O+] = (1.0 x 10^-14) / (8.5 x 10^-13)

= 1.18 x 10^-2 M

So the solution is acidic