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Does tap water and seawater contain dissolved solids and gases?

Description

In this experiment, tap water and seawater is evaporated to reveal solid residues. They are also boiled to release their dissolved gases.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
does-tap-water-and-seawat...


Tap water and seawater is evaporated to reveal solid residues. They are also boiled to release their dissolved gases.

Apparatus Chemicals

Eye protection

The teacher will need:

Round-bottomed flask (250 cm3), 2

Bung and delivery tube, to fit flask (see diagram) 2

Tripod and gauze, 2

Bunsen burner

Heat resistant mat, 2

Stand and clamp, 2

Beaker (250 cm3), or small trough, 2

Test-tube, 2

Each group of students will need:

Hard glass watch-glasses, approximately
 7.5 cm diameter, 3

Beaker, 100 cm3

Bunsen burner

Tripod

Gauze

Heat resistant mat

Tongs

The teacher will need:

Seawater, 400 cm3(Note 1)

Each group of students will need:

Seawater, 5 cm3(Note 1)

Distilled (or deionised) water, 5 cm3

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

 

 



 





Page last updated October 2015

In this experiment, tap water and seawater is evaporated to reveal solid residues. They are also boiled to release their dissolved gases.

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.