Equal volume of solutions with pH equal to 4 and pH equal to

10 are mixed. pH of the resulting solution is

Answer:7

Explanation:

H + concentration of solutions is related to pH as -

[H+] = antilog (-pH)

For pH = 4,

[H+] = antilog (-4)

[H+] = 10^-4 M

For pH = 10,

[H+] = antilog (-10)

[H+] = 10^-10 M

When these 2 solutions are added, concentration of the mixture will be -

[H+] = √ (10^-10 * 10^-4)

[H+] = √ (10^-14)

[H+] = 10^-7 M

So now, pH of the mixture will be

pH = - log (10^-7)

pH = 7