nomor dua tolong dijawab dong

[tex]m \: = \frac{n}{v} = \frac{gr}{mr} \times \frac{1000}{v} \\ m \: = \frac{2.8}{56} \times \frac{1000}{100} \\ m \: = \frac{28}{56} = 0.5 = 5 \times {10}^{ - 1} [/tex]
[OH-] = b. Mb = 1 x 5 x 10^-1 = 5 x 10^-1

pOH = 1 - log 5
pH = 13 + log 5