Classroom Resources salty seas

Published on October 22nd, 2013 | by Simi

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Salty seas

The amount of salt in the oceans is an important indicator of the state of our oceans. A recent NASA study has mapped the varying concentrations of salt over a one year period.

The video report of this study is given here.

a It is estimated that there are approximately 1,335,000,000 cubic kilometres in the oceans. On average, every litre of seawater has approximately 35 grams of dissolved salt. Calculate the approximate weight of salt in the oceans.

b If a cubic kilometre of water contains 35 grams of salt per litre, how much fresh water needs to be added to it so that the resulting volume of water has a concentration of 32 grams of dissolved salt per litre? (This variation does occur in areas of very high rainfall or where a large river system flows into the sea.)

 

Question created by Chaitanya Rao, Daniel Mathews, Norman Do and Michael Evans

 

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