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Two 22.0 mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, were titrated with 0.100 M HI. Answer each of the following questions regarding these two titrations.
a) What is the volume of added base at the equivalence point for KOH in mL?
b) What is the volume of added base at the equivalence point for CH3NH2 in mL?
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).
which molecule will undergo only london dispersion forces when interacting with other molecules of the same kind?
calculate the number of excess reagent units remaining when 154 C6H14 molecules and 1539 O2 molecules react?
Calculate the masses of the solid you must measure out to prepare 100mL EACH OF 0.025 M KNO3 , 0.025 M CuSO4, 0.025 M Ca(NO3)2, and 0.025 M KCl . include waters of hydration when clculating the formula wights.
Hydrochloric acid (HCl) reacts with sodium carbonate (Na2CO3), forming sodium chloride (NaCl), water (H2O), and carbon dioxide (CO2). This equation is balanced as written
C2H5OH (l) + 3O2(g) ---------> 2CO2(g) + 3H2O(l) ?H = - 1.37 x 103 kJ When a 24.8-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?
Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 degrees celsius to 67 degrees celcius.
Which of the following constants is/are needed to calculate the amount of energy required to heat 30.5g of H2O(s) at -25.0 degreeC to H20(L) at 5.0 degreeC?
A sample of Nitrogen gas expands in volume fro 1.6 L to 5.4 L at constant temperature. Calculate the work done (in joules) if the gas expands
For the reaction: N2(g) + 2 O2(g) ? 2 NO2(g), Kc = 8.3 × 10-10 at 25°C. What is the concentration of N2 gas at equilibrium when the concentration of NO2 is twice the concentration of O2 gas.
Determine the pH of an aqueous solution of CaCO3 that contains 1.7*10^-6 M of hydroxide ion [OH^-].
We have a refrigeration unit that works at a pressure of 0.1MPain the evaporator and 1 MPa in the condenser. The refrigeration unit uses a compressor with an efficiency of 90%
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