2. Testing pH of buffer solution sample
2.1 Record number of buffer solution sample in the report.
2.2 Measure buffer solution sample for five test tube, 2cm3 buffer solution of each
2.3 Add indicator in each test tube, three drops of each (Table 2.1 ). Swirl each test tube for unifrom mixing, and then record color comparing to pH
2.4 Predict pH of buffer solution sample.