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What is seawater and how could we use it?
Foreword
This lesson will provide students with an opportunity to make their own sea salt from fresh seawater. After a week or so, the salt crystals will have formed and the pupils will have an opportunity to observe and study them up close on the big screen with a microscope.
There will also be an opportunity to see if it is a viable way of making money for the school from the sea.
Previous Learning
Pupils have read the folk tale of ‘How the Sea Became Salty’ from China as one of our pupils has Chinese heritage, but there are many others from many different cultures.
They have looked into where salt comes from – looked at salt mines in Romania and Spain and open air saltwater plains on Mallorca and old saltwater plains on Anglesey along with the new methods employed by them.
Resources
Glass jars/beakers, seawater, paperclips, salt, cotton string, dowel, elastic band, petri dishes, microscope, beach visit, filter.
Activities
Pupils will be given the opportunity to collect seawater from the beach, filter it and use it to make their own salt.
They will put 30ml of filtered seawater into petri dishes and leave them in a sunny/warm location for the water to evaporate. The pupils will have an opportunity to study these salt crystals as they dry with a microscope and make observations.
The pupils will be given an opportunity to grow their own salt crystals in a highly salinized solution.
Research the cost of Halen Mon in shops and the quantity of salt included. Is it a viable way of making money for the school fair? Can we make the school some money? How much did we make with our salt in petri dishes?
How It Looked
Next Steps
The pupils will be given an opportunity to grow their own salt crystals in a highly salinized solution.
Looking into the effect salt has on the body.
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