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May 29, 2015

Homework Help: science

Posted by Jin on Wednesday, May 7, 2008 at 4:25pm.

Would you expect the dissolved oxygen concentration of water samples taken from a lake at 7 am to be higher or lower than samples takn at 5 pm?

I feel like there may be more dissolved oxygen in the sample taken at 7 am because photosynthesis probably took place and oxygen was produced. However, I think that the sample taken at 5 pm is equally valid choice because the oxygen probably accumulated in water. But- the temperature of the water is probably higher and so there will be less dissolved oxygen.
Please help me out. Thanks in advance!

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