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    what does a negative water potential mean
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    Pure water (H2O only) has a water potential of 0.
    As you add solute to it the water becomes less able to move so it's water potential lowers into the negative.

    Negative water potential = things have been dissolved in it
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    Water potential is the measure of water to move from one area to another. Pure water has a water potential of 0. Water potential can never be positive, so a negative water potential has solutes in it. The more negative it is the more solutes present. Water moves from an area of high water potential (i.e. less negative, less solutes, hypotonic etc.) to an area of low water potential.
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    As you stated, deionised (pure) water has a water potential of 0. Your also right in thinking that as solute is dissolved in this pure water, it's water potential moves further away from zero. Seems like you understand the basic concept!
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    (Original post by loukas2993)
    As you stated, deionised (pure) water has a water potential of 0. Your also right in thinking that as solute is dissolved in this pure water, it's water potential moves further away from zero. Seems like you understand the basic concept!
    lol, neither of the two replies were from the original poster.
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    (Original post by Pheonixx)
    lol, neither of the two replies were from the original poster.
    Silly billy
 
 
 
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