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Testing the pH of oxides

Description

The aim of this experiment is to help establish the idea that the pH of oxides vary. Students will discover that the soluble oxides of metals are alkaline and the oxides of non-metals are acidic.

Credits

:
This resource has been provided by, or developed in partnership with, Nuffield Foundation
testing-the-ph-of-oxides



Apparatus Chemicals

Eye protection

Each working group will require:

Test-tubes, 6

Test-tube rack

pH colour chart

Access to solutions as follows (Notes 1 and 2):

Nitric(V) acid (labelled ‘Nitrogen oxide and water’), 0.2 M (IRRITANT)

Phosphoric(V) acid (labelled ‘Phosphorus(V) oxide and water’) 0.2 M

Sulfuric(VI) acid (labelled ‘Sulfur dioxide and water’) 0.2 M

Potassium hydroxide (labelled ‘Potassium oxide and water’) 0.2 M (IRRITANT)

Sodium hydroxide (labelled ‘Sodium oxide and water’) 0.2 M (IRRITANT)

Limewater (labelled ‘Calcium oxide and water’).

Universal indicator solution (FLAMMABLE), full range, in a dropper bottle (or bottle with dropper pipette)

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

 





 


Page last updated October 2015

The aim of this experiment is to help establish the idea that the pH of oxides vary. Students will discover that the soluble oxides of metals are alkaline and the oxides of non-metals are acidic.

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 .