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pOH=3
OH⁻ = 10⁻³
OH⁻ =x.M
10⁻³ =1.M
M =10⁻³
M =gr/mr.1000/ml
10⁻³ =gr/56.1000/250
=16.10⁻³ gr <--
semoga membantu :)
V = 250 mL = 0,25 L
Mr KOH = 56