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co= K/ alfa₂
co=4*10-⁵ / 4*10-⁴
co=0,1 mol /dm3
2
K=alfa²*C/1-alfa
K=0,09*6×10(-4 /0,91
K=w przybliżeniu 6*10 do minus 5
3alfa-=√k/co
alfa=1*10do minus 5