Level Burette Readings cm3 CBR Y cm3 Standard Deviation Amount of NaNO2 found 1 2 3 Final 7.90 7.90 7.80   7.90   0.0469   1.098 g Initial 0.00 0.00 0.00 Difference 7.90 7.90 7.80

Table 4b: Burette Readings (In the presence of potato pieces). For sodium Nitrite (Stock solution: 1.1g/250cm3): Pilot Reading 7.00 to 9.00 cm3