General Chemistry 2

  1. Lactic acid, HC\(_3\)H\(_5\)O\(_3\), is a waste product that accumulates in muscle during exertion, leading to pain and a feeling of fatigue. In a 0.100 M aqueous solution, lactic acid is 3.7% dissociated. Calculate the value of K\(_a\) for this reaction.

  2. A buffer solution consisting of 0.60 M HF and 1.0 M KF (Ka of HF = 7.2 x 10\(^-4\)) is titrated by 0.1 mol NaOH. After the NaOH is added, there is 1 L of solution. Find the pH of the solution.

  3. How many moles of Mg(OH)\(_2\) can be dissolved in a 1 L solution that already contains 0.52 moles Mg\(^{2+}\).

    Mg(OH)\(_2\) K\(_{sp}\) = 8.9 x 10\(^{-12}\)

  4. What is the standard free energy change, \(\triangle\)G\(^\circ\), for the following reaction at 25\(^\circ\)

    Cu\(^{2+}\) (aq) + Fe (s) \(\longrightarrow\) Cu (s) + Fe\(^{2+}\) (aq)

  5. The following initial rate data was collected for the reaction, 2 NO + O\(_2\) \(\longrightarrow\) 2NO\(_2\)

    rate of reaction chemistry help

    Find X and Y for the given rate law, rate = k[NO\(_2\)]\(^X\)[O\(_2\)]\(^Y\)

  6. Use the pseudo steady state hypothesis to derive the rate law for the rate of production of P

    $$E~+~S~\mathop{\leftrightharpoons}^{k_1}_{k_{-1}}~ES$$ $$ES~\xrightarrow{k_2}~E~+P$$

  7. Predict the effect an increase in H\(_2\) would have on the following reaction. What if we increase the temperature? If we remove H\(_2\)O?

    CO (g) + H\(_2\)O (g) \(\leftrightharpoons\) CO\(_2\) (g) + H\(_2\) (g) + heat, K\(_C\) = 5.10

  8. Find the pH of 2.0 M HF, ( K\(_a\) = 7.1 x 10\(^{-4}\) )

  9. A buffer solution consisting of 0.60 M HF and 1.0 M KF (Ka of HF = 7.2 x 10\(^-4\)) is titrated by 0.2 mol HCl. After the HCl is added, there is 1 L of solution. Find the pH of the solution.

  10. The solubility of Ce(IO\(_3\))\(_3\) in a 0.20 M KIO\(_3\) solution is 4.4 x 10\(^{-8}\) mol/L. Calculate K\(_{sp}\) for Ce(IO\(_3\))\(_3\).

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