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