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GCSE Chemistry · key term
A measure of how acidic or alkaline a solution is: values below 7 are acidic, 7 is neutral and values above 7 are alkaline.
Used by AQA, Edexcel and OCR
Specification 4.4.2.6, 4.10.1.2 · Paper 1, Paper 2
A numerical measure related to the hydrogen ion concentration of a solution; lower pH means a higher hydrogen ion concentration.
Revise: Strong and Weak AcidsThe pH of a solution is related to its hydrogen ion concentration.
A numerical measure of how acidic, neutral or alkaline a solution is.
Specification 3.4, 3.5, 3.6 · Paper 1
A measure of how acidic or alkaline a solution is: 7 is neutral, values below 7 are acidic and values above 7 are alkaline.
Revise: Ion Concentration and pHThe pH of a solution tells you how acidic or alkaline it is: pH 7 is neutral, an acidic solution has a pH below 7, and an alkaline solution has a pH above 7.
A measure of how acidic or alkaline a solution is; a lower pH corresponds to a higher hydrogen ion concentration.
Specification C3.3i, C3.3j, C3.3k, PAG 6, PAG 7 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A measure of the relative acidity or alkalinity of a solution, determined by its hydrogen ion concentration.
Revise: Hydrogen Ions and pHA solution with a high concentration of hydrogen ions has a low pH and is relatively acidic. A solution with a lower concentration of hydrogen ions has a higher pH and is less acidic. In this learning outcome, pH values are interpreted as whole numbers.
A measure related to the concentration of hydrogen ions, H⁺, in a solution; a lower pH corresponds to a higher hydrogen ion concentration.
A numerical measure of how acidic, neutral or alkaline a solution is; acidic solutions have values below 7, a neutral solution has pH 7 and alkaline solutions have values above 7.
A numerical measure of how acidic or alkaline an aqueous solution is; pH 7 is neutral, values below 7 are acidic and values above 7 are alkaline.
A measure of how acidic or alkaline a solution is; a neutral solution has a pH of about 7.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A numerical measure related to the concentration of hydrogen ions in a solution.
Revise: pH and hydrogen ion concentrationA greater hydrogen ion concentration corresponds to a lower pH.
A measure of the acidity or alkalinity of a solution, determined by its hydrogen ion concentration.
A measure of how acidic or alkaline a solution is.
Only compare the pH values of strong and weak acids directly when their concentrations are the same.
State both the factor and the direction in pH questions: a decrease of 1 pH unit means 10 times the hydrogen ion concentration.
For a difference of several pH units, use a power of 10. For example, a difference of 3 units represents a factor of .
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