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Verified answer
Mr KOH = (ar k + ar O + ar H)= 39 + 16 + 1
= 56
M = massa KOH/mr x 1000/V
1 = massa KOH/56 X 1000/400
1= massa KOH/56 x 2,5
1 = 2,5 x massa KOH /56
2,5 x massa KOH = 1 x 56
massa KOH = 56/2,5
Massa KOH = 22,4 gram
jadi massa KOH yang sibutuhkan adalah 22,4 gram