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Calculate the pH at the equivalence point for the titration of 0.130 M methylamine (CH3NH2) with 0.130 M HCl. The Kb of methylamine is 5.0× 10-4.
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted. If 0.260 moles of
10-nC point charge is located at the center of a thin spherical shell of radius 8.0 cm carrying -20 nC distributed uniformly over its surface. What is the magnitude of the electric field 2.0 cm from
Determine the pH of (a) a 0.20 M NH3 solution, (b) a solution that is 0.20 M in NH3 and 0.30 M NH4Cl
We most often express heat as kilocalories and kilojoules rather then calories and joules. When 1 pound of fat is burned in the body,9.4 kilocalories of energy is produced. Express that as a) calori
What volumes of 0.150 M acetic acid and 0.065 M NaOH solutions must be mixed to prepare 1.00L of a buffer solution of pH 4.50 at 25C.(Show all work for 5 stars)
The Ksp of lead(II) carbonate, PbCO3, is 7.40 × 10-14. Calculate the molar solubility of this compound.
Two small plastic spheres each have a mass of 1.2g and a charge of -55.0nC . They are placed 2.6cm apart (center to center). find the magnitude of the electric force on each sphere
Sodium chloride has a solubility of 35.7g/100mL water. If you have 350mL of water and you add 115g of sodium chloride to it and mix well.
Two spherical objects with a mass of 5.35 kg each are placed at a distance of 2.35 m apart. How many electrons need to leave each object
How many grams of hydrochloric acid are in 500.0 mL of a 5.000 M solution? 1. 36.50 g 2. 54.75 g 3. 73.01 g 4. 91.25 g
Calculate the number of grams of sucrose (C12H22O11) needed to prepare 0.500 L of a 1.00 M sucrose solution. 1. 85.5 g 2. 171 g 3. 342 g 4. 684 g
Explain how to prepare 0.250 L of a 0.500 M CuSO4 solution. 1. Measure out 0.500 moles of CuSO4 solid 2. Measure out 20.0 g of CuSO4 solid 3. Measure out 0.500 moles of CuSO4 solid and add water unt
Write the balanced total ionic equation and the net ionic equation (including phase labels) for the reaction between HCl(aq) and NaOH(aq).
A hot-air balloon is rising upward with a constant speed of 2.68 m/s. When the balloon is 5.62 m above the ground, How much time elapses before the compass hits the ground
What total volume of a 2.25M sodium chloride aqueous solution contains 0.45 moles of sodium chloride ? *1.0 L *2.3 L * 0.20 L *0.020 L *0.045 L
three point charges are arranged in a equilateral triangle of side a= m. Sketch the field lines due to + Q and -Q, What is the x-component of the force
Arrange the following in order of decreasing acidity. I. benzoic acid (C6H5CO2H) II. benzyl alcohol (C6H5CH2OH) III. phenol (C6H5OH)
A spring-loaded cannon aimed at 47 deg. above the horizontal is on the last car of a long train of flat cars. How far from the cannon on the train does the projectile land
On a hot summer day, a young girl swings on a rope above the local swimming hole. how high above the water was she when she let go of the rope
Write the balanced total ionic equation and the net ionic equation (including phase labels) for the reaction between HC2H3O2(aq) and NH3(aq).
A tortoise and hare start from rest and have a race. As the race begins, both accelerate forward. The hare accelerates uniformly at a rate of 0.9 m/s2 for 4.5 seconds. What is the acceleration of th
Calculate the pressure that CCl4 will exert at 53°C if 1.00 mol occupies 34.2 L, assuming that CCl4 obeys the ideal-gas equation; CCl4 obeys the van der Waals equation.
A red ball is thrown down with an initial speed of 1 m/s from a height of 27 meters above the ground. How long does it take the red ball to reach the ground