Prac 5 - Weak and Strong acids

Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts 
18 March 2024
1 / 15
next
Slide 1: Slide
ChemistrySecondary EducationAge 12,13

This lesson contains 15 slides, with text slides.

Items in this lesson

Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts 
18 March 2024

Slide 1 - Slide


  • use the universal indicator to quantify the pH value of different acids
  • identify the product produced when reacting acids with metals
  • evaluate the strength of acids by making several different observations
Our Learning Goals

Slide 2 - Slide


  • acid - a substance that dissolves in water, producing H+ (aq) ions - a solution of acid turns litmus red and has a pH below 7; it acts as a proton donor
  • alkalis - soluble bases that produce OH-(aq) ions in water - a solution of an alkali turns litmus blue and has a pH above 7
  • indicator - a substance that changes colour when added to acidic or alkaline solutions, e.g., litmus or thymolphthalein
  • methyl orange - an acid-base indicator that is red in acidic and yellow in alkaline solutions
  • pH scale - a scale running from below 0 to 14, used for expressing the acidity or alkalinity of a solution; a neutral solution has a pH of 7
  • Universal indicator - a mixture of indicators that has different colours in solutions of different pH
Keywords

Slide 3 - Slide

Slide 4 - Slide

Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts 
18 March 2024

Slide 5 - Slide


  • Report any acid spills to your teacher immediately. The universal indicator will stain your clothing and skin.
  • Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
  • Sodium hydroxide and sodium carbonates are irritants.
  • Wear eye protection throughout. 
SAFETY ⚠️

Slide 6 - Slide

Materials Checklist

Slide 7 - Slide


Which of the two acids (Acid X and Acid Y) could be strong?
Experimental Question

Slide 8 - Slide

Write your team hypothesis or prediction.
Hypothesis
timer
2:00

Slide 9 - Slide

Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts 
18 March 2024

Slide 10 - Slide


Follow the steps on pages 114, 115, 116 of your practical workbook.
Experiment Proper

Slide 11 - Slide


  • Report any acid spills to your teacher immediately. The universal indicator will stain your clothing and skin.
  • Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
  • Sodium hydroxide and sodium carbonates are irritants.
  • Wear eye protection throughout. 
SAFETY ⚠️
timer
50:00

Slide 12 - Slide


  • Wash the materials you used.
  • Clean your table.
  • Return the washed/ cleaned materials.
Clean-up
timer
7:00

Slide 13 - Slide

Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts 
18 March 2024

Slide 14 - Slide


  • Share the results of your experiment.
  • What similarities and differences have you noticed?
Wrap-up

Slide 15 - Slide