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SAT II Chemistry : Acid-Base Reactions

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Example Questions

Example Question #1 : Identifying And Defining Acids And Bases

Which of the following cannot act as a Bronsted-Lowry base (proton recipient) in aqueous solution?

Possible Answers:

HCO_3^- $\displaystyle HCO_3^-$

NH_3 $\displaystyle NH_3$

OH^- $\displaystyle OH^-$

H_2O $\displaystyle H_2O$

NH_4^+ $\displaystyle NH_4^+$

Correct answer:

NH_4^+ $\displaystyle NH_4^+$

Explanation:

NH_4^+ $\displaystyle NH_4^+$ cannot receive another proton (H^+) $\displaystyle (H^+)$ because then it would become $NH_5^{2+}$ $\displaystyle NH_5^{2+}$ , which does not exist. All of the other answer choices are fine:

$NH_3 \Rightarrow NH_4^+$ $\displaystyle NH_3 \Rightarrow NH_4^+$

$HCO_3^-\Rightarrow H_2CO_3$ $\displaystyle HCO_3^-\Rightarrow H_2CO_3$

$H_2O\Rightarrow H_3O^+$ $\displaystyle H_2O\Rightarrow H_3O^+$

$OH^-\Rightarrow H_2O$ $\displaystyle OH^-\Rightarrow H_2O$

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Example Question #1 : Reaction Types

A scientist makes a solution by adding 0.2 grams of NaOH $\displaystyle NaOH$ to enough water so that the resulting solution has a volume of 10 liters. What, approximately, is the pH of this solution?

Possible Answers:

$\displaystyle 12$

$\displaystyle 2$

$\displaystyle 10$

$\displaystyle 11$

$\displaystyle 3$

Correct answer:

$\displaystyle 11$

Explanation:

NaOH $\displaystyle NaOH$ has a molar mass of approximately 40 g/mol, meaning that there is 0.01 mol of it in the solution. Sodium hydroxide is a strong base and completely dissociates in water. Its concentration in the solution is $\frac{0.01}{10}=10^{-3}$ $\displaystyle \frac{0.01}{10}=10^{-3}$ $\frac{mol}{L}$ $\displaystyle \frac{mol}{L}$ . This means that the concentration of H^+ $\displaystyle H^+$ ions is $\frac{10^{-14}}{10^{-3}}=10^{-11}$ $\displaystyle \frac{10^{-14}}{10^{-3}}=10^{-11}$ and $-\log (10^{-11}) = 11$ $\displaystyle -\log (10^{-11}) = 11$ . Thus, the pH of the solution is 11.

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SAT II Chemistry : Acid-Base Reactions

Study concepts, example questions & explanations for SAT II Chemistry

All SAT II Chemistry Resources

Example Questions

Example Question #1 : Identifying And Defining Acids And Bases

Example Question #1 : Reaction Types

All SAT II Chemistry Resources

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