Molar mass of NaOH,
MM = 1*MM(Na) + 1*MM(O) + 1*MM(H)
= 1*22.99 + 1*16.0 + 1*1.008
= 39.998 g/mol
mass(NaOH)= 5.7 g
use:
number of mol of NaOH,
n = mass of NaOH/molar mass of NaOH
=(5.7 g)/(40 g/mol)
= 0.1425 mol
volume , V = 1*10^2 mL
= 0.1 L
use:
Molarity,
M = number of mol / volume in L
= 0.1425/0.1
= 1.425 M
So,
[NaOH] = 1.425 M
So,
[OH-] = 1.425 M
use:
pOH = -log [OH-]
= -log (1.425)
= -0.1538
use:
PH = 14 - pOH
= 14 - -0.1538
= 14.1538
Answer:
pH = 14.15
pOH = -0.154
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