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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 merge with the silver cations to produce bright white silver chloride precipitate.
Suppose an EPA chemist tests a 200.mL sample of groundwater known to be contaminated with cadium chloride, which would react with silver nitrate solution like this:
CuCl2 (aq) + 2AgNO3 (aq) -> 2AgCl(s) + Cu(NO3)2 (aq)
The chemist adds 43.0mM silver nitrate solution to the sample until silver chloride stops forming. She then washes, dries, and weighs the precipitate. She finds she has collected 8.9mg of silver chloride.
Calculate the concentration of cadium chloride contaminant in the original groundwater sample. Round your answer to 2 important digits.
Calculate Qsp for calcium fluoride (Ksp=3.9x10^-11) when 195.0 mL of a 0.00780 M solution of Ca(NO3)2 is added to 175.0 mL of a 0.00740 M solution of KF
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What was the volume of the gas when the temp was changed to 50.0C and the new pressure was 760.0 torr.
student performed two melting-point determination on a crystalline compound. in one determination the capillary tube contained a sample about 1-2 mm in hight and the melting range was found to be 141-142C
If you added 75ml of a 0.555M solution of NaCl to enough water to produce 950 ml of solution, what would be the resulting molarity?
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.
A metal sulfide is 71.6% metal by mass. What is the mass fraction of the metal in the metal sulfide?
A certain reaction releases 10.1 kJ at constant volume and at constant pressure releases 8.4 kJ. What is the (delta)U for the reaction?
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