Question

Calcular el pH de una solución que se prepara con 5 gramos de NaOH y se completa el volumen a 1200 mL.

Answer 1

Mm NaOH = 40 g/mol

calcular mol

mol = 5 g/ 40 g/mol
mol = 0.125

2. convertir 1200 mL / 1000 = 1.2 L

3. calcula M = mol/V(L)

M = 0.125 mol / 1.2 L
M = 0.104 molar

4. calcula pOH

pOH = - log [OH⁻]

pOH = - log  ( 0.104)

pOH = - ( -0.983)  = 0.983

pOH + pH = 14

pH = 14 - 0.983

pH = 13.017