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You work for a large urban water company. A pipe has broken in a recycling plant and flooded the inside of the building. The company recycles batteries, fluorescent lights, and electronic equipment, so hazardous levels of silver, mercury and lead ions may have contaminated the floodwaters.
You are the only person in the department who has had college chemistry, so your supervisor has asked you to devise a procedure to test the waters for the presence of AG^+, Hg^2+, and/or Pb^2+ ions. This procedure is to be written in a step-wise fashion, so that a technician in the water qualify laboratory will be able to follow it. Also an explanation of each step should be given. Why would you do that? What does it accomplish? How does it accomplish the separation and/or identification of a particular ion? Samples of the food waters have already been collected and are already waiting in the laboratory for you. You will follow your procedure to test a sample for yourself during your scheduled lab time.
Assuming that the water is contaminated, devise a method for disposing of the contaminated water without contaminating the environment, but allowing the recycling plant to resume operations as soon as possible.
What is a meniscus? Why do some liquids develop a meniscus? How do we read the liquid level in a volumetric measuring device
Calculate the mass (in mg) of KCN needed to make 500. mL of aqueous KCN solution with a pH of 10.00.
Celsius is allowed to expand into an evacuated vessel of 2.50 L volume. Does the gas do work? Explain
when 31g of phosphorus reacts with oxygen, 71g of an oxide phosphorus is the product. What mass of oxygen is needed to produce 13g of this product?
Which of the following involve an increase in the entropy of the system under consideration?
Which of the following bond moments would cancel the lone pair moment? S=O S-F N-H another lone pair Consider the molecules F2, OF2, PF3, CF4, and BF3. Which molecules have a dipole moment?
Calculate the pH at the equivalence point in titrating 0.100 M solution of sodium hydrogen chromate (NaHCrO_4 )with .080 M NaOH.
Brass is a copper and zinc alloy containing 31.8% zinc by mass and having a density of 8.73 {\rm \frac{g}{cm^3}}. A fitting composed of common brass has a total volume of 335.6 {\rm cm^3}
In the reaction of noroborene to noroborenol, the exo, and endo forms are created. Why exactly is the exo form favored over the endo form
Calculate the mass of water formed by the complete reaction of 935 g of propane (C3H8) with excess oxygen. (Write a balanced equation)
What is the molar concentration of a H3PO3 solution if 150.00 mL of the solution was required to neutralize 75.00 mL of NaOH whose concentration was 1.50 molar?
If 120.9 mL of water is shaken with a gas at 0.860 atm, it will dissolve 0.00286 g of the gas. Estimate the Henry's law constant for the gas in water in units of g L-1 atm-1.
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