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Homework #3

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    Write the products of these acid-base reactions. Balance the complete reaction.

    1. \(HF_{(aq)} + KOH_{(aq)} \rightarrow\)
    2. \(H_2SO_{4\;(aq)} + Ca(OH)_{2\;(aq)} \rightarrow\)


    Balance the following redox reaction in basic conditions with state symbols.

    \[H_2O_{(l)} + Na_{(s)} \rightarrow Na^+_{(aq)} + H_{2\;(g)}\]


    In a lab experiment, a 20.00 ml \(HNO_2\) solution was titrated with \(0.1234\; M\) sodium hydroxide solution, and the equivalence point was reached when 43.21 ml of this basic solution was added. What is the original molarity of the \(HNO_2\) solution?


    What is the required mL of 1.25 M \(HBr\) necessary to completely neutralize a 175 mL sample of 2.38 M \(Mg(OH)_2\)?


    A rubber duck is initially filled with 100 mL air at \(2 ^oC\) in the bathroom and then set in the sun to be heated. The final temperature increases to \(10 ^oC\) at constant pressure.


    What is the final condition of the rubber duck? Does it shrink or expand? What is its final volume?


    A commercial balloon is filled with 3000 L helium gas at \(30^oC\). If the pressure is 1 atm, what is the mass of helium gas? Why does the balloon float?


    Uranium hexafluoride (\(UF_6\)) is a compound used in the uranium enrichment process that produces fuel for nuclear reactors and nuclear weapons. It forms solid grey crystals at standard temperature and pressure and boils at 56°C.


    Figure: Uranium hexafluoride crystals sealed in an ampoule

    The density of uranium hexafluoride is 12.6 g/L at 745 torr. What is the temperature in °C under these condition?


    A constant-volume container has 2.00 moles gas sample at 25 °C and the gas sample exerts a pressure of 450 torr. If 2.00 moles more gas is added in the container and the temperature is increased to 50 °C, what is the pressure in atm?

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