3. Preparation of Buffer Solution and pH Testing
3.1 Prepare buffer solution with 25cm3 of 2M NH4OH and 50cm3 of 1M NH4Cl, and then theoretical calculate pH of prepared buffer solution.
3.2 Determine pH of prepared buffer solution by measuring buffer solution into five test tube, 2cm3 of each. The indicator is added for three drops of each indicator. (as shown in report table of step 3.2). Swirl each test tube and then record color comparing to pH range indicator as shown in table of step 1.1 Predict the pH of prepared buffer solution
3.3 Testing buffer solution capability is made by measuring buffer solution into three large test tube, 10cm2 of each