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One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chloride anions in solution will combine with the silver cations to produce bright white silver chloride precipitate.
Suppose an EPA chemist tests a 250mL sample of groundwater known to be contaminated with cadmium chloride, which would react with silver nitrate solution like this:
CdCl2 (aq) 2AgNO3 (aq) = 2AgCl (s) Cd(NO3)2 (aq)
The chemist adds 82mM silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected 6.2mg of silver chloride.
Calculate the concentration of cadmium chloride contaminant in the original groundwater sample. Be sure your answer has the correct number of significant digits.
A 50.0g silver object and a 45.0 g gold object are both added to a 55.5 mL of water contained in a graduate cylinder. what is the new water level in the cylinder.
Using an unmanned rocket to visit the space station requires 85.2 trillion BTU of energy. The best fuel for the mission will have the highest ratio of energy to volume.
Assuming the vinegar solution has a density of 1.01 g/ml calculate the percent by weight of acetic acid in your sample of vinegar. How does that value compare with 5 percent the value for the percent acetic acid in normal vinegar? I had 10.0ml of ..
What is the maximum number of orbitals that can be identified by each of the following sets of quantum numbers?
What is the osmotic pressure of a solution that contains 4.26 ×10-3 moles of lactose in 111 mL of solution at 29C?
What is the mass of sodium ion circulating in the blood if the concentration of sodium ion in this individual is 0.135M.The average adult has a total blood volume of 5 liter.
The weight of the product (Hexaphenylbenzene) for this part of the reaction was 2.04 g. What is the percentage yield? What is the overall percent recovery for the three step process?
This time took a one-hour break after adding the acetic anhydride but before adding the sodium acetate solution. The student obtained no product. Explain, with chemical equations and/or formulas, what went wrong.?
15.0 moles of gas are in a 6.00 L tank at 24.1 degrees C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constantsfor methane are a = 2.300 L^2 atm/ mol^2 and b = 0.0430 L/mol
2 NaClO3 2 -> NaCl + 3 O2 Determine the number of moles of O2 produced by the decomposition of 639 g of NaClO3.
calculate the number of molecules present in each of the following samples.
If a 220 piece of gold (density =19.32 ) is hammered into a sheet measuring 2.41.0 , what is the average thickness of the sheet in meters?
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