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General Chemistry Principles, Patterns, and Applications, 2011

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c. C3H 7NO2( aq) +OH - ( aq) C3H6NO2 - ( aq) + H2O( l)<br />

d. CH 3CO2H ( aq) + 2HF( aq) CH 3C ( OH )2 + ( aq) + HF2 - ( aq)<br />

2. Salts such as NaH contain the hydride ion (H − ). When sodium hydride is added to water, it produces hydrogen<br />

gas in a highly vigorous reaction. Write a balanced chemical equation for this reaction <strong>and</strong> identify the<br />

conjugate acid–base pairs.<br />

3. Write the expression for K a for each reaction.<br />

a. HCO3- ( aq) + H2O( l) CO32 - ( aq) + H 3O + ( aq)<br />

b. formic acid( aq) + H2O( l) formate( aq) + H 3O + ( aq)<br />

c. H 3PO4 ( aq) + H2O( l) H2PO4 - ( aq) + H 3O + ( aq)<br />

4. Write an expression for the ionization constant K b for each reaction.<br />

a. OCH 3-( aq) + H2O( l) HOCH 3( aq) +OH -( aq)<br />

b. NH 2 - ( aq) + H2O( l) NH 3( aq) +OH - ( aq)<br />

c. S2 - ( aq) + H2O( l) HS -( aq) +OH -( aq)<br />

5. Predict whether each equilibrium lies primarily to the left or to the right.<br />

a. HBr ( aq) + H2O( l) H 3O + ( aq) + Br -( aq)<br />

b. NaH ( soln) + NH 3( l) H2( soln) + NaNH 2( soln)<br />

c. OCH 3-( aq) + NH 3( aq) CH 3OH ( aq) + NH 2 -( aq)<br />

d. NH 3( aq) + HCl( aq) NH 4 + ( aq) + Cl -( aq)<br />

6. Species that are strong bases in water, such as CH 3 − , NH 2 − , <strong>and</strong> S 2− , are leveled to the strength of OH − , the<br />

conjugate base of H 2 O. Because their relative base strengths are indistinguishable in water, suggest a method<br />

for identifying which is the strongest base. How would you distinguish between the strength of the acids<br />

HIO 3 , H 2 SO 4 , <strong>and</strong> HClO 4 ?<br />

7. Is it accurate to say that a 2.0 M solution of H 2 SO 4 , which contains two acidic protons per molecule, is 4.0 M<br />

in H + ? Explain your answer.<br />

8. The alkalinity of soil is defined by the following equation: alkalinity = [HCO 3 − ] + 2[CO 3 2− ] + [OH − ] − [H + ]. The<br />

source of both HCO 3 − <strong>and</strong> CO 3 2− is H 2 CO 3 . Explain why the basicity of soil is defined in this way.<br />

9. Why are aqueous solutions of salts such as CaCl 2 neutral? Why is an aqueous solution of NaNH 2 basic?<br />

10. Predict whether aqueous solutions of the following are acidic, basic, or neutral.<br />

a. Li 3 N<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

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