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cH⁺ = 0,001mol/dm³
α =cH⁺*100%/c₀
c₀ = cH⁺*100%/α
c₀ = 0,001*100%/4% =0,025mol/dm³
cnz = c₀ - cH⁺ = 0,025mol/dm³ - 0,001mol/dm³ = 0,024mol/dm³
nnz = V*C = 0,5dm³*0,024mol/dm³=0,012mola