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1) REQUIMTE, Departamento de Química, Faculdade de Ciências da Universidade do Porto.
Rua do Campo Alegre, 687 4169-007 Porto, Portugal.
The aim of this study was the evaluation of the adequacy of several experiments, using data-logging, to enhance students’
learning about acid/base.
Activities developed:
4. Conclusions:
The results suggested that these experiments strongly enhanced students’ understanding of acid/base and
improved students’ experimental and investigative skills in using ICT in chemical laboratory.
1. Objective:
- Measuring the pH value of several household solutions,
using a pH sensor.
Student’s learning about acid/base –
a case study using data-logging Liliana C. G. Cruz1, M.Gabriela T. Cepeda Ribeiro1
Twenty two students aged 14 – 16 years old, were involved.
2. Sample:
3. Methodology:
Students had to plan investigations, analyze data and to formulate conclusions based on calculations and
graphics.
To evaluate students’ learning, data were collected using several instruments: questionnaires, observation,
group interviews, group discussions and participants' reflections about the work developed.
Insight Graph
Time (seconds)MON:15:21
0 20 40 600
5
10pH
(units)
Sumo de limao pH=2.5
Leite pH=6.6
Vinagre pH= 3.1
Gel de Banho pH=4.7Café pH=5.3
Coca-Cola pH= 2.7
Água da Torneira pH=7.5
Detergente Amoniacal pH= 10.7
Água do mar pH=8.3
- Studing antacids
- Titration (strong acid – strong base)
Insight Graph
Time (minutes)WED:17:07
0 5 10 15^0
5
10pH
(units)
Antiácido Alka-Seltzer
pH inicial=1.6 pH=1.5Tempo=5.8min.
pH=4.8pH=4.5Tempo=6.8min.
Insight Graph
Time (minutes)TUE:10:05
0 5 10 150
5
10pH
(units)
0
10
20
30
Deriv
ed 1
Titulação ácido forte-base forte