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King Hailu

What does the negative sign mean in Langmuir's isotherm?

This is langmuir' equationQe = QmbCe / (1+bCe) where as  Qe=  heavy metal adsorbed to adsorbent (mg/g)Qm = maximum adsorption capacity (mg/g)b= langmuir 's constantCe =equilibrium concentration of heavy metal solution (mg/)when i set it as LINEAR 1/Qe = 1/Qm + (1/bQm)(1/Ce)when i plot 1/Qe againt with 1/Ce i got  y = 81.6X -6.8and i am wondering1.what does it mean with this negative sign (-6.8) when calculate the intercept Y  = 1/Qm2. i need to calculatedintercept Y = 1/Qm = 1/-6.8  so Qm = -0.14??     or only 1/6.8Thank you for you help :))

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