MEASURING CONCENTRATIONS EXTENSION Name Phosphates & Algae Growth Date You are a
ID: 1061462 • Letter: M
Question
MEASURING CONCENTRATIONS EXTENSION Name Phosphates & Algae Growth Date 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 offertilizers from other sources such as detergents in the 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? 2. In lab, you used the precipitation of calcium carbonate to measure the concentration of 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 E might help.Explanation / Answer
1) Answer is YES
Because of increased dissolved organic phosphates the algal bloom also increased. By using these phosphates primitive cyanobacteria and blue-green algae will multiply, so it leads to reducing the dissolved O2 in the aquatic biome results in death of small aquatic fish. This leads to loss of ecosystem equilibrium.
Lots of phosphates is present in the toxic sewage, it decreases the water surface tension and content of dissolved will be affected in aquatic environment. Finally it leads to threatening of extinction of aquatic insects.
Q) Does it disapprove claim?
Answer is Yes. Aquatic environment temparature is increased because of severe industrial revolution. And also a less amount of toxic material is produced from and it leads to formation of layers on the locations where they hide by the procedure of clogging. In this way insects in aquatic environment under prone to threat.
2)
Na2Co3 (aq) + Cacl2 -------> Caco3 (s) + 2Nacl (aq)
To get phosphate ion precipitation in H2O, add Calcium chloride solution.
Results in formation of Calcium Phosphate.
2Po43- + 3CaCl2(aq) ------------> Ca3(Po4)2 (s) (Precipitate) + 6Cl-(aq)
Due to increased salt mass and complexity , the solubility nature in water reduces.
3) You can get the precipitation M3(PO3)2 and Mg3(PO4)2
Here M = Fe, Cu, Al, Zn ........ etc
4)
a) Moles before dilution = Moles after dilution
12.5 mL X1 = 250 mLX conc
conc =12.5/250
= 0.05mM
b)
0.05mM X 20mL = 100mL X Phosphate conc
Phosphate concentration = 1/100 = 10-2 mM
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