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ANSWER ONLY QUESTION 4, QUESTION 3 is for reference only

QUESTION 3 Determining the amount of sulfate ion (SO.2-) dissolved in seawater in the unit of molarity As we all know seawater is salty. This is because many salt ions are dissolved in the seawater, which is not the case in the freshwater. Among many ions, Nat and Clare the most abundant ions dissolved in the seawater followed by SO,, Mg²+, Ca?', and Kions. So sulfate (S0?) ion is the second most abundant anion in the seawater. In the next question you will be asked to write an analytical procedure to determine the molar concentration of So, 2 dissolved in the seawater by using a gravimetric method as explained in the previous Questions #1 and #2. But before you write the procedure you have to first decide what proper reagent you have to pick to precipitate 50,- ions in the seawater sample. QUESTION So in this question, the two candidates reagents are introduced for your final selection: BaCl, and CaCly. Explain clearly which reagent you must pick. Explain also whether both reagents will work, or one of the two will work better than the other, or one of them will not work. (One of the hints is to look up Table 4.2 in Chapter 4). For the toolbar, press ALT FOP) ALTEN F10 Mac TT TAS 31120 T.EE Both reagants will work but we must pick 336.2 because precipitation with more efficient and precipitation with Cal2 would be less efficient