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What are the dissolved solids in seawater?

Description

In this experiment, seawater is evaporated to give different salts. These salts are analysed by testing for cations and anions.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
what-are-the-dissolved-so...



Apparatus Chemicals

Goggles

The teacher will need:

Beakers (say 2000 cm3, 400 cm3, 250 cm3, 100 cm3), 1 of each

Bunsen burner

Tripod and gauze

Heat resistant mat

Vacuum filtration apparatus (Note 1)

Test-tubes, 6

Test-tube rack

Nichrome wire, short lengths for flame tests (Note 2)

Watch-glass

Seawater, about 1 dm3 (Note 3)

Limewater (IRRITANT), 50 cm3

Silver nitrate solution, 0.1 M, 10 cm3

Barium chloride solution, 0.1 M (HARMFUL),
10 cm3

Magneson reagent, 1 cm3 (Note 4)

Concentrated hydrochloric acid, (CORROSIVE), 5 cm3

Dilute hydrochloric acid, 2 M (IRRITANT), 10 cm3

Dilute nitric acid, 2 M (CORROSIVE), 10 cm3

Distilled or deionised water, 20 cm3

Refer to Health & Safety and Technical notes section below for additional information.

 




 



Page last updated October 2015

In this experiment, seawater is evaporated to give different salts. These salts are analysed by testing for cations and anions.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.