Question

Larutan 100 cm^3 H2SO4 ph = 2 diencerkan hingga volume larutan menjadi 1000cm^3 maka ph larutan yang terbentuk adalah...

Answer 1

V1 = 100 cm3
pH = 2
v2 = 1000 cm3

pH akhir = pH awal + log v2/v1
pH akhir = 2 + log 1000/100
pH akhir = 2 + 1
pH akhir = 3

cara lain:
pH = 2
pH = - log [H+]
2 = - log [H+]
[H+] = 10⁻²
v1.[H+]1 = v2. [H+]2
100 x 10⁻² = 1000 x [H+]2
[H+]2 = 10⁻³

pH = - log[H+]2
pH = - log 10⁻³
pH = 3