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GCSE Chemistry · key term
A negatively charged ion represented by OH⁻.
Used by Edexcel and OCR
Specification 3.1, 3.4, 3.10 · Paper 1
A negatively charged ion written as . Alkalis produce these ions in solution.
Revise: Ion Sources in Acids and AlkalisNotice that the minus sign belongs to the whole hydroxide ion.
Do not confuse the ions: hydrogen ions are , whereas hydroxide ions are .
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A negatively charged ion, OH⁻, supplied by an alkali in solution.
A negatively charged ion with the formula . Alkalis in solution are sources of these ions.
Specification C3.3c · Paper 1 (Foundation), Paper 3 (Higher)
A negatively charged ion made of hydrogen and oxygen, represented by OH⁻.
Revise: Acids and Alkalis IonsThe sodium ions identify this particular alkali, while the hydroxide ions are what you should look for in an alkaline solution.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Ions in acids and alkalisAn alkali is a base that dissolves in water. Its solution contains hydroxide ions, OH⁻. Sodium hydroxide is one example.