PROCEDURE:

            + Trial 1:

A.     Preparation of paint:

1. Weighed 4.2g, 8g, 12g, and 16g of NaHCO₃ in the polystyrene cups.

2. To each cup added paint to 50 mL mark

3. Stirred with stirring spoon till well mixed.

B. Painting:

     1. Painted a piece of wood with normal paint.

     2. Painted and labeled similar wood pieces using paint contained 4.2g, 8g , 12g and 16g of NaHCO₃ respectively.

     3.  Leaved the woods dry approximately for 1 – 2 days.

C. Painting with ash:

     1. Weighed 4.2g of ash into a polystyrene cup

     2. Added household paint to the 50 mL mark.

     3. Painted a piece of wood using this paint.

D. Burning the woods

     1. Burnt the wood starting from the one with no sodium hydrogen carbonate to the higher concentration of NaHCO₃ within 30 seconds and under constantly controllable flame. Recorded the time when the wood started to catch fire.

      2. Burnt the wood that was painted with the mixture of ash and paint within 30 seconds, under constantly controllable flame. Recorded the time when the wood started to catch fire.

 Trial 2:

A.     Preparation of paint:

1.      Weighed 10g of ash and 20g of NaHCO₃ in two polystyrene cups. (NaHCO₃ and ash could not have the same mass  because V_ash   would exceeded the 50 ml volume required and would not dissolve in paint easily. )

2.      To each cups added paint to the 50 mL mark.

3.      Stirred with stirring spoon to well mix.

B.      Painting:

1.      Painted and labeled the two same sizes of wood with paint containing 10g of ash and 20g of NaHCO₃ respectively.

2.      Kept them for 2 days to dry.

C.     Burning:

1.      Burnt the wood painted with NaHCO₃, recorded the time taken for the wood to catch  fire.

2.      Burnt the wood painted with ash, recorded the time taken for the wood to catch fire.