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A solution contains 2.2 × 10-3 M in Cu2+ and 0.33 M in LiCN. If the Kf for Cu(CN)42- is 1.0 × 1025, how much copper ion remains at equilibrium
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 50.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
Which of the following acids (listed with pKa values) and their conjugate base would form a buffer with a pH of 8.10
Four identical cells, each of emf 2V are joined in parallel providing supply of current to external circuit consisting of two 15 ohm resistors joined in parallel, Calculate the internal resistance o
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10-5.
When a gas is collected by displacement of water,the gas often appears foggy as it is generated. what it means to say that a gas collected by this technique is saturated with water vapor.
A capacitor consisting of two plates separated by a distance d of 4.25 x 10^-3, with an area A of 8.15 x 10^-4 m^2, What is the numerical value of the energy for the capacitor
The solubility of which one of the following compounds will increase if the pH of a saturated solution of the compound is lowered
Scientists want to place a 3 × 103 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 1.8 times the radius of Mars above the surface of the planet, Wh
when oxygen is in use in hospital room,no smoking signs are usually posted prominently. Explain.
What is the pH of a solution that contains 0.50 M H2CO3 and 0.50 M NaHCO3? (Ka1 = 4.3 X 10-7, Ka2= 5.6 X 10-11)
What would be the best indicator for the titration of 0.20 M CH3COOH titrated with 0.2 M NaOH? (Ka for acetic acid = 1.8 X 10-5) The pH ranges for the color change of some common acid base indicator
How many moles of silver metal are produced in 1.2 hours by the electrolysis of AgNO3(aq) using a current of 6.0 A
The capacitance of an empty capacitor is 2.5 x 10^-6 F. The capacitor is connected to a 3 volt battery and charged up, Write the equation for q in terms of K, C(subscript zero), and V
If you want to dope GaAs to make an n-type semiconductor with an element to replace Ga, which of the elements below would you pick
A standard hydrogen electrode is immersed in an acetic acid solution. This electrode is connected by an external circuit to an iron nail dipping into 0.10 M FeCl2. If Ecell is found to be 0.24 V, wh
You have a flashlight that uses 0.75 watts of power and requires 1.5 volt battery, How many joules of energy are used by the flashlight in 15 minutes
use oxidation number to show which element is oxidized and which element is reduced in this equation 2H2o2----2H2O+O2
describe the crystal lattic structures you examined,indicating the number of positine ions surrounding each negative ion,and vice versa
What is the value of the equilibrium constant for the reaction between Al(s) and Cd2+(aq), at 25 °C?
A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed, What is the magnitude of the tension in the string when the ball is at the bottom of the circle
A copper, Cu(s), electrode is immersed in a solution that is 1.00 M in ammonia, NH3, and 1.00 M in tetraamminecopper(II), [Cu(NH3)4]^{2+}. If a standard hydrogen electrode is used as the cathode, th
A voltaic cell with Mn/Mn2+ and Cd/Cd2+ half-cells has the following initial concentrations: [Mn2+] = 0.090M and [Cd2+] = 0.060M. What is the equilibrium concentration of Cd2+