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A solution is created by adding 0.05 moles of H2CO3 (3.1 g, total mass) to 5-L of water, resulting in a pH of 4.2. Now, we add sodium hydroxide (NaOH, strong base) until the pH reaches 10. You can neglect any changes in volume. What is the alkalinity of this solution
When 50 mL of water contains 0.50 moles HCl at 22.5 degrees celsius is added to 50.0mL of water containing 0.50 mol NaOH at 22.5 degrees celsius in a calorimeter, the temperature of the solution increases to 26.0 degrees celsius.
Show by explicit integration that the 1s and 3s wave functions of the hydrogen atom are orthogonal. Note that in integrals over r
An element has two isotopes with masses of 62.9396 u and 64.9278 u,and 30.83% of the atoms are the heavier isotope. Calculate the atomic mass of this element and give its name and symbol.
Consider the following equation: CO + 2 H2 → CH3OH ?H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2.
How about for a solution of nitric acid (which has pKa of -1.4) Do the calculation for a formal concentration. of 1M and for the formal concentration of 0.1M.
The compound is composed of 41.39% carbon, 3.47% hydrogen and 55.14% oxygen. The molecular mass is 116.07 g/mol. What is the molecular formula?
The ionization constants for sulfurous acid are Ka1 = 1.4*10^-2 and Ka2 = 6.3 * 10^-8. Species that need to be calculated (Molarity):
What is the partial pressure of Br2 at equilibrium? What is the partial pressure of I2 at equilibrium? What is the partial pressure of IBr at equilibrium?
One student measure the pH of the following three solution (weak base, conjugate acid and buffer). Using this data, please calculate the pKa and pKb (show calculation).
the activation energy for the decompostion of HI to H2 and I2 is 186 kJ/mol. The rate constant at 555 K is 3.2 x 10^-7 L/mol*s.
shown to contain 12.518 g silver, 0.6970 g carbon, and 2.786 g oxygen. What is the empirical formula of the sample?
Explain the dissolution of the sulfides of copper, bismuth and cadmium in nitric acid. Include ionic equations. If a yellow precipitate is obtained upon addition of hydrogen sulfide to an unknown solution of Group II cations, which ions are probably..
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