A beaker with 110 A beaker with 110Solution5 476 log SA S

Solution

5 = 4.76 + log (S/A)

=> S/A = 1.738

S+A = 0.1

=> A = 0.0365 M

and S = 0.0635 M

pH = 4.76 + log (0.0635 x 0.11 - 0.0062 x 0.49 / 0.0365x0.11 + 0.0062 x 0.49)

=> pH = 4.508

Change = 5 - 4.508 = 0.492