Estimate the number of H+(aq) ions in a single drop of: water; 1.0 mol dm-3 HCl; 1.0 mol dm-3 NaOH.
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H⁺ ions in water
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Creative Problem Solving in Chemistry: H⁺ ions in water
Level
Specification
- Northern Ireland
- Wales
- Republic of Ireland
- England
- A/AS level
- AQA Chemistry
- Edexcel Chemistry
- Topic 12: Acid-base equilibria
- 4. be able to define the term ‘pH’
- 5. be able to calculate pH from hydrogen ion concentration
- 6. be able to calculate the concentration of hydrogen ions, in mol dm⁻³, in a solution from its pH, using the expression [H⁺] = 10⁻ᵖᴴ
- 8. be able to calculate the pH of a strong acid
- 11. be able to define the ionic product of water, Kw
- 12. be able to calculate the pH of a strong base from its concentration, using Kw
- Topic 5: Formulae, Equations and Amounts of Substance
- Topic 12: Acid-base equilibria
- OCR Chemistry A
- Module 2: Foundations in chemistry
- Module 5: Physical chemistry and transition elements
- 5.1 Rates, equilibrium and pH
- 5.1.3 Acids, bases and buffers
- b) the role of H⁺ in the reactions of acids with metals and bases (including carbonates, metal oxides and alkalis), using ionic equations
- d) use of the expression for pH as: pH = –log[H⁺]; [H⁺] = 10⁻ᵖᴴ
- e) use of the expression for the ionic product of water, Kw
- f) calculations of pH, or related quantities, for: strong monobasic acids; strong bases, using Kw
- 5.1.3 Acids, bases and buffers
- 5.1 Rates, equilibrium and pH
- A/AS level
- Scotland
- National 5
- SQA Chemistry
- Chemical changes and structure
- Acids and bases
- pH
- The pH scale is an indication of the hydrogen ion concentration and runs from below 0 to above 14.
- Water is neutral as it dissociates according to the equation 2H₂O (l) ⇌ H⁺ (aq) + OH⁻ (aq) producing equal concentrations of hydrogen and hydroxide ions. At any time, only a few water molecules are dissociated into free ions
- Acidic solutions have a higher concentration of H⁺(aq) ions than OH⁻(aq) and have a pH below 7.
- Alkaline solutions have a higher concentration of OH⁻(aq) ions than H⁺(aq) ions and have a pH above 7.
- pH
- Acids and bases
- Chemical changes and structure
- SQA Chemistry
- National 5
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