1). Prepare the unknown solution by quantitatively transferring all the unknown into the 250mL volumetric flask (the weight of your sample will be provided in the lecture CRN). Dilute to the mark and mix well. 2.) Total Alkalinity: Pipet a 25.00mL aliquot of unknown solution into a 250mL flask and titrate with standard 0.1M HCl, using bromocresol green indicator. Carefully titrate the solution until it just turns blue to green (yellow is past the endpoint, indicating acidity.) Then boil (1-2 min) the solution to expel CO2. The solution should return to a blue color. (if it does not, then you have already reached your endpoint.) Carefully add HCl from the burette until the solution turns green again. Repeat this procedure with 2 more 25.00mL aliquots. Record all volumes. 3.) Bicarbonate content: Prepare each solution just before titrating. Pipet 25.00mL of unknown and two 25.00mL aliquots (50.00mL total) of standard 0.1M NaOH into a 250mL flask. Swirl and add 10mL of 10 wt% BaCl2, using a graduated cylinder. Swirl again to precipitate BaCO3, add 2 drops of phenolphthalein indicator, and immediately titrate with standard 0.1M HCl. Repeat this procedure with two more 25.00mL samples of unknown. 4.) Blank titration: Titate with standard 0.1M HCl a mixture of 25mL of boiled DI water, 10mL of wt% BaCl2 and 50.00mL of standard 0.1M NaOH, and add 2 drops of phenolphthalein indicator. Repear this procedure twice more. The difference moles of HCl needed in steps 4 and 3 equals the mole