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[H^+] = √(Kw ÷ Kb) × M
2 × 10^-5 = √(10^-14 ÷ 10^-5) × M
4 × 10^-10 = 10^-9 × M
M = 0,4
M = (gr ÷ Mr) × (1000 ÷ mL)
0,4 = (gr ÷ 53,5) × (1000 ÷ 250)
gr = 5,35