Thread: Biology help with the gizmos?

A sample of seaweed contains two liters of water and has 100 grams of salt dissolved in its cells. The seaweed is placed in a bucket with 4 liters of water and 300 grams of dissolved salt. What will occur when the system reaches equilibrium?

simple osmosis question. first look at the concentration of NaCl in the H2O. Without even looking into raw numbers, you will have higher concentration of salt in the 4L water and 300g of salt over the 2L water and 100g of salt. If the crappy plants are allowed to equilibrate at 100gNaCl in 2 L H20, putting it in higher concentrated salt water will pull water out of the seaweed cells because the solution is hypertonic to the seaweed cells.
sorry about the rambling, but when the system reaches equilibrium, water will leave the seaweed and into the hypertonic solution.

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Originally Posted by Paul W

simple osmosis question. first look at the concentration of NaCl in the H2O. Without even looking into raw numbers, you will have higher concentration of salt in the 4L water and 300g of salt over the 2L water and 100g of salt. If the crappy plants are allowed to equilibrate at 100gNaCl in 2 L H20, putting it in higher concentrated salt water will pull water out of the seaweed cells because the solution is hypertonic to the seaweed cells.

sorry about the rambling, but when the system reaches equilibrium, water will leave the seaweed and into the hypertonic solution.

i think the water will go into the seaweed cells because osmosis goes from high concentration to low concentration which is from outside to inside of the cell so it is hypotonic(into) not hypertonic(out).