Creative Problem Solving in Chemistry: H⁺ ions in water

No comments

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.

Downloads

H⁺ ions in water
Handout | PDF, Size 38.93 kb
Using the problems
PDF, Size 30.49 kb

Download all

No comments

Level

16-18 years

Use

Specification

Northern Ireland
- A/AS level
  - CCEA Chemistry
    - Unit A2 1: Further Physical and Organic Chemistry
      - 4.5 Acid-base equilibria
        4.5.3 carry out calculations involving pH for strong acids, strong bases and weak acids;
Wales
- A/AS level
  - WJEC Chemistry
    - Unit 3: PHYSICAL AND INORGANIC CHEMISTRY
      - 3.9 Acid-base equilibria
        (d) how to use pH, Kw, Ka and pKa in calculations involving strong and weak acids and pH and Kw in calculations involving strong bases
Republic of Ireland
- Leaving Certificate
  - Chemistry
    - 9. Environmental chemistry: water
      - 9.1 pH Scale
        Depth of treatment
        Self-ionisation of water, Kw;
        pH scale. Use of universal indicator paper or solution. Limitations of the pH scale - usefulness confined to dilute aqueous solutions.
        pH of weak acids and bases.
        Activities
        Calculation of pH of dilute aqueous solutions of strong acids and bases (calculation of pH of mixtures of strong acids and bases not required).
England
- 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.

Feature
Using gestures in the classroom
2020-09-21T10:01:00Z
Harness the power of hands to supercharge students’ retrieval and problem solving and assess their understanding
Resource
Innovations in packaging
2020-09-14T10:48:00Z
Explore polymers and redox via food wrap innovations with this activity for 11–16 students
Job profile
Chief technology officer
2020-07-19T08:41:00Z
Cristina helps develop technology that could change lives by extracting disease from the body

No comments yet

You're not signed in.

Only registered users can comment on this article.

More Resources

Resource
Properties of polymers
2020-09-17T11:28:00Z
A lesson presentation with activities for your 11–14 students on polymers and their properties
Resource
Smartphone spectroscopy: changing concentrations
Use your smartphone to measure changes in concentration across different juice drinks at home or in the classroom. Includes a video aimed at learners, kit list, instruction and explanation.
Resource
Improve students’ graph skills
2020-09-10T09:23:00Z
A diagnostic exercise, practical and worksheet to assess and boost students’ grasp of graphing

Creative Problem Solving in Chemistry: H⁺ ions in water

Downloads

H⁺ ions in water

Using the problems

Level

Use

Category

Specification

Related articles

Using gestures in the classroom

Innovations in packaging

Chief technology officer

No comments yet

Only registered users can comment on this article.

More Resources

Properties of polymers

Smartphone spectroscopy: changing concentrations

Improve students’ graph skills