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If Ka is 1.85E-5 for acetic acid, calculate the pH at one half the equivalence point and at the equivalence point for a titration of 50mL of 0.100M acetic acid with 0.100M NaOH.
The formation constant Kf for the complexion Zn(OH)42- is 2.8 1015. What is the concentration of zinc ion,Zn2+, in a solution that is initially 0.50 M inZn(OH)42-?
7- Magnesium sulfate, MgSO4, is added to 463 mL of 0.010 Msodium hydroxide, NaOH, until a precipitate just forms. How many grams of magnesium sulfate were added?
Find the magnitude, Fn of the force rquired to slide the lawnmover over the ground at constant speed by pushing the handle.
What are the equilibrium partial pressures of N2O4 andNO2 when 1.000 atm of N2O4 is introduced into a 500.0 mL containerat room temperature?
Calculate the speed of (a) a proton and (b) an electron after each particle accelerates from rest through a potential difference of 250V.
They are then released from rest simultaneously and allowed to interact via the electric force. Which particle reaches the origin first?
Calculate the mass in g of the PbI2(s)(yellow precipitate) that is formed afterreacting with 1mL of 0.1M KI solution + 1mL of 0.06MPb(NO3)2 solution and then, add another 1mLof 0.1M KI solution.
Calculate the tension in the string when the angular velocity of the turntable is 60 rpm (rotations per minute).
A mass of 360g stretches a spring 2cm. If the spring-mass system is placed in a medium that imparts a viscous force of 1N when the speed of the mass is 1cm/sec, find the damping coefficient for this
When .514g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.8 degrees C to 29.4degrees C.
A straight 1.71mm diameter copper wire can just "float" horizonally in air because of the force of the Earth's magnetic field B which has a component that is horizontal, perpendicular to the wire, a
A method to increase oil production in areas drilled through limestone deposits is to use hydrochloric acid to increase drainage channels through the stone.
A charge q1 is inside a spherical surface (although not necessarily at the exact center of the sphere). A second charge q2 sits just outside the surface. Choose whether the following statements are
The pKa values for H2SeO3 at25o C are 2.64 and 8.27. Write the base-hydrolysis equilibrium equations forSeO32-(aq) andHSeO3-(aq)ions, and calculate the equilibrium constant values
Approximately what is the magnitude of the magnetic field of magnet A a distance of 0.36 m from the center of the magnet, along the same axis?
A very long wire carrying a conventional current of 3.9 amperes is straight except for a circular loop of radius 5.8 cm. Calculate the approximate magnitude and the direction of the magnetic field a
(a) A loop of wire carries a conventional current of 0.6 amperes. The radius of the loop is 0.06 m. Calculate the magnitude of the magnetic field at a distance of 0.37 m along the axis of the loop,
Calculate the pH of a solution preparedby mixing equal volumes of 20.0 M methylamine (CH3NH2 Kb = 3.7 *10^-4) and 0.60 M CH3NH3Cl.
A 5.5-kg block slides down a frictionless incline making an angle of 50.0° with the horizontal. (a) What is the total work done on the block when the block slides 1.6 m (measured along the incline
A tuning fork is sounded above a resonating tube(one end closed) which resonates at a length of 0.2m and again at 0.6m. What is the frequency of the fork when the speed of sound is taken to be 340m/
Two identical batteries, each with an emf of 18V, and an internal resistance of 1 Ohm, are wired in parallel by connecting their positive terminals together and connecting their negative terminals t
A) Copper contains 8.4 x 10^28 free electrons/m^3. A copper wire of cross-sectional area 7.4 x 10^-7 m^2 carries a current of 1 A. Find the electron drift speed.
14.0mg of a certain protein was dissolved in water to make asolution of 2.50mL at 28.0o C. If the osmotic pressureis 1.30torr, what is the molecular mass of the protein?
A pitcher hurls a 0.25kg ball around a vertical circular path of radius 0.6 m, applying a tangential force of 30N, before releasing it at the bottom of the circle (underhand pitch).