In this investigation you will test three water samples from different sources for pH and the presence of dissolved solids. After distillation of the sea water, you will test the water again to check that dissolved solids have been removed, making the water fit to drink.
lesson found here: www.tes.com/teaching-resource/potable-water-11771314
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Clear and easy to follow method for an RP that students struggled with on last year's exam
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