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25.00 mL aliquot of 0.016 M NaCl was titrated with 27.52 mL of 0.18 M AgNO3. Determine whether a precipitate will form at end point. Ksp AgCl = 1.6 x10-10
A solution of Ba(OH)2 was standardized against 0.1016g of primary standard benzoic acid C6H5COOH. Calculate the concentration of Ba(OH)2 if the end point was 20.89mL
A photon has a wavelength of 750 nm. Calculate the energy of the photon in joules.
ion has 20 electrons and 20 neutrons while G ̄ ion has 20 electrons and 19
neutrons. Write a complete symbol in the form of X for atom W and atom G.
P4 + 5O2 P4O . How many litres of oxygen will be required at s.t.p. for complete oxidation
of 12.4g of phosphorous? (P = 31, 0 = 16 and molar volume of a gas at s.t.p. = 22.4 litres)
if a single replacement reaction between aqueous chlorine and a solution of aluminum bromide and no precipitate forms what should I write it as?
6. Answer the following electrochemistry questions:
a) A Cu(s)/Cu2+(aq) half-cell and a CI-(aq)/CI2(g) half-cell are coupled together to make a voltaic cell.
i. Determine the net spontaneous cell reaction which would occur and calculate E°cell.
ii. Draw a sketch of the voltaic cell formed in part i). In your sketch, show which chemical species are present (and where), label the electrodes and any other important parts. Be sure to show also the direction of electron and ion flow.
b) For the following electrochemical cell operating at 25.0 °C:
3Zn(s) + 2Cr3+(aq, 0.0095 M) → 3Zn2+(aq, 0.0078 M) + 2Cr(s)
calculate E°cell, Ecell, ΔG°, ΔG and Keq.
3. Propanoic acid (CH3CH2COOH) is a weak organic acid with Ka = 1.3 x 10-5.
a) Calculate the pH of 200.0 ml of a 0.200 M solution of propanoic acid to which was added 5.00 g of sodium propanoate (CH3CH2COONa). Assume no volume change occurs. Briefly describe the properties of this solution.
b) Calculate the final pH if 0.011 mol of NaOH is added to the solution in part a). Again, assume no volume change.
4. A 25.0 mL sample of 0.35 M HCOOH, formic acid, is titrated with 0.20 M KOH. What is the
pH of the solution at the equivalence point of titration?
Given the Ka of HCOOH = 1.77 x 10-4.
5. Some SO2 and O2 are mixed together in a flask at 1100 K in such a way that, at the instant of
mixing, their partial pressures are 1.00 and 0.500 atm, respectively. When the system
comes to equilibrium at 1100 K, the total pressure in the flask is found to be 1.35 atm.
Calculate Kp at 1100 K for the reaction:
2 SO2(g) + O2(g) 2SO3(g)
#339914 on Dec 2023