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Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOH required for precipitation to begin in each case.
A: 2.0*10-2 M CaCl2
B. 2.4*10-3 M Fe(NO3)2
C. 1.8*10-3 M MgBr2
The probability that the annual peak will equal or exceed the median value in any single year. The average return period of the median value.
How many mL of 0.64 molar NaOH must be added to 39 mL of 0.11 molar HCl to completely neutralize the acid.
Phenol (C6H5OH, also called carbolic acid) has a pKa of 9.89. It is used to preserve body tissues and is quite toxic. Calculate the percent ionized in 0.0503 M phenol--a dilute solution.
a burning candle produces a luminous flame. What is the fuel for the burning candle. Why is the flame luminous
A 40-year-old manager, at a prominent legal firm in L.A., experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps
a coal-burning power plant generates electrical power at a rate of 500 megawatts that is 500 x 10 to the 6th power pr
Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = .5400 atm and Ppcl3 =.430 atm
Use Henderson-Hassalbach equation. The pKa of Tris-HCl is 8.1. After you have added 1 N HCl to adjust the pH of the Tris solution to 8.1, what is the ratio (in mmols) of Tris to Tris-HCl in the resulting buffer solution?
an ideal gas is expand at a constant temperature with the pressure changing from 10 bar to 1 bar. assume Cp,m = 5/2R calculate delta U, delta H, delta S
The emission spectrum of an unknown element contains two lines-one in the visible portion of spectrum and the other
100.0 mL of 1.020 M HCl and 50.0 mL of 2.040 M NaOH, each at 24.53ºC, are mixed in a Styrofoam cup calorimeter. What is the final temperature of the mixture if the heat of acid-base neutralization (?Hneut) = ?57 kJ per mole of H2O formed
A 322 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 635 mmHg. Calculate the moles of Ar present.
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