MATERIALS:

           Trial 1:

                        -200mL polystyrene cups x 6

- Stirring spoon

                        - Household paint (interior Latex, Low luster, premium acrylic , water- based)

                        - Paint brush

                        - Digital balance

                        - 40.2g NaHCO₃ powder.

                        - 4.2g Ash which contains KHCO₃

                        - Stop watch

                        - Lighter

                        - 6 pieces of household wood

                        - Camera

            + Trial 2:

                        -200 mL polystyrene cups x 2

                        - Stirring spoon

                        - Household paint (interior Latex, Low luster, premium acrylic, water- based)

                        - Paint brush

                        - Digital balance

                        - 20 g NaHCO₃ powder.

                        - 10g Ash which contains KHCO₃

                        - Stop watch

                        - Lighter

                        - 2 same sized pieces of household wood

                        - Camera