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v = 0,5 L = 500 ml
m = 10,7 / 53,5 * 1000/500 = 0.4 m
h = √ (kw * m) / kb = (10 ^ -14 x 0,4) / (10 ^ -5) = 2 x 10 ^ -5 m
ph = 5 - log 2
Jadi jawabanya A