1)A sample of helium0.755281845He

gas collected at a pressure of atm and a temperature of K is found to occupy a volume of milliliters. How many moles of gas are in the sample? Mol

2) Consider the following unbalanced redox reaction occurring in acidic solution:

H2SO3 (aq) + IO3-(aq) → SO42-(aq) + I2 (aq)

a) Balance the reaction.

b) Using your table of standard reduction potentials, calculate ΔG°rxn for this reaction.

3)  Barium carbonate (BaCO3) is used in rat poison, bricks, ceramic

glazes, and cement. the Ksp of BaCO3 is 2.58x10^-9.
a) is BaCO3 acidic, basic or neutral? how can you tell?
b) what is the molar solubility of BaCO3 in pure water?
C) what is the pH of a saturated BaCO3 solution? the Ka of the bicarbonate ion (HCO3) is 5.6x10^11.
D) if you were to titrate a saturated solution of BaCO3. what would you use aaas titrant? qualitatively sketch the titration curve. clearly label your axes, the buffer region, and indicate whether the equivalence point is acidic, basic or neutral.