You are a technician at the local water analysis company Aquate, LLC and your gr
ID: 493954 • Letter: Y
Question
You are a technician at the local water analysis company Aquate, LLC and your group is asked to develop a method for analysis of phosphate in water samples. When phosphates enter the water from the runoff of fertilizers or from other sources such as detergents in wastewater, the phosphate level may increase enough to cause significant algae growth. In the inland bays of Delaware, fertilizer runoff and septic overflow are thought to be responsible for several algae blooms in recent years that have resulted in turbid oxygen depleted water, fish kills, and large accumulations of rotting foul smelling algae. You need to develop a reliable way to measure the amount of phosphates in water samples; if we know where high concentrations of phosphate are, we can start addressing significant points of release. You will adapt your skills of determining solution concentration from lab to address the phosphate concentration measurement 1. Look up the SDS for sodium phosphate tribasic, Does the Ecological Information support the claim that soluble phosphate can harm fish? Does it disprove the claim Yes, sin ce sodham p tri basic will Chan p H drm st cry, c, e to basic will increase Solubility of many gasos, espe y ot 2. In lab, you used the of calcium Sol 4 Less precipitation carbonate to measure the concentration of O sodium carbonate in a solution. To measure the amount of phosphate in the water, we will form a different precipitate. Choose a compound that you can add to a solution of phosphate to cause a precipitate to form. Why will this compound work? Hint: Appendix might help cites of Phosphate will work because sin ce the ex wil) Precipitate all PO) 3 in s ol ron.Explanation / Answer
Yes, there are plenty of precipitates... and each will precipitate at different concentrations, since they have different solubilities.
If we use Aluminium... we could get:
Al+3 + 3OH-(aq) = Al(OH)3(s) as a preciptate
If we use
Mg+2 + CO3-2 = MgCO3(s) typical for "hard" water conditions
therefore
OH- and CO3-2 ions could precipitate as well
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