Chemistry Questions & Answers

45. [Application] Acid rain. One study found that the average pH value of rainfall in Utah was about 5.8 and in Pennsylvania it was about 4.4. How much more acidic was the rainfall in Pennsylvania than the rainfall in Utah?

What is the formula for the conjugate base of HI ? (A) \( \mathrm{H}_{21+} \) (B) \( 1 \cdot \) (C) \( \mathrm{HIO}+ \) (D) 10 -

Which equation properly depicts the reaction between \( \mathrm{HNO}_{3} \) and water? (A) \( \mathrm{HNO}_{3}(\mathrm{aq})+\mathrm{H} 2 \mathrm{O}(\mathrm{l}) \Leftrightarrow \mathrm{H} 3 \mathrm{NO} 4(a q) \) (B) \( \mathrm{HNO} 3(\mathrm{aq})+\mathrm{H} 2 \mathrm{O}(\mathrm{l}) \Leftrightarrow \mathrm{NO}-(\mathrm{aq})+\mathrm{H} 3 \mathrm{O}+(\mathrm{aq}) \) (C) \( \mathrm{HNO} 3(\mathrm{aq})+\mathrm{H} 3 \mathrm{O}+(\mathrm{aq}) \Leftrightarrow \mathrm{H} 2 \mathrm{NO} 3+(\mathrm{aq})+\mathrm{H} 2 \mathrm{O} \) (I) (D) \( \mathrm{HNO}_{3}(\mathrm{aq})+\mathrm{OH}-(\mathrm{aq}) \Leftrightarrow \mathrm{NO}_{3}-(\mathrm{aq})+\mathrm{H} 2 \mathrm{O} \) (l)

41. pH of human blood. The hydrogen ion concentration \( \left[\mathrm{H}^{+}\right] \)of blood is approximately \( 3.98 \times 10^{-8} \) moles per liter. Find the pH value of human blood to the nearest tenth. Is human blood acidic or basic?

Using the Bronsted-Lowry definition, classify each of the following as an acid, a base, or as amphiprotic, Prompts (1) H 2 O Select match (2) \( \mathrm{H3O}+ \) (3) \( \mathrm{OH}= \)

\( \frac { 0 } { \nabla } XCl _ { 2 } ( aq ) + \frac { 0 } { \nabla } AgNO _ { 3 } ( aq ) \rightarrow \frac { 0 } { \nabla } X ( NO _ { 3 } ) _ { 2 } ( aq ) + \frac { 0 } { \nabla } AgCl ( s ) \)

\( H _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + \underset { NaOH } { \rightarrow } Na _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + H _ { 2 } O \)

- \( 2 \mathrm{C}_{6} \mathrm{H}_{14}+19 \mathrm{O}_{2} \ldots \mathrm{Co}_{2}+14 \mathrm{H}_{2} \mathrm{O} \) - If I start with 38 grams of \( \mathrm{C}_{6} \mathrm{H}_{14} \) and 54 g of \( \mathrm{O}_{2} \) how many grams of water should I end up with?

2. Complete las siguientes ecuaciones a. Metano + cloro \( \frac{\text { luz }}{\text { b. Acido Butanoico }+\mathrm{HNO} 3} \mathrm{OHNO2} \) ? c. Pentanol + O2 (exceso) ?

In Exercises \( 13-16 \), use the following information. Negative ions, designated by the notation \( \left[\mathrm{OH}^{-}\right] \), are always present in any acid or base. The concentration, \( \left[\mathrm{OH}^{-}\right] \), of these ions is related to \( \left[\mathrm{H}^{+}\right] \)by the equation \( \left[\mathrm{OH}^{-}\right] \cdot\left[\mathrm{H}^{+}\right]=10^{-14} \) moles per liter. Find the concentrations of \( \left[\mathrm{OH}^{-}\right] \)and \( \left[\mathrm{H}^{+}\right] \)in moles per liter for the substances with the following pH values. 13. \( \mathrm{pH}=6 \) 14. \( \mathrm{pH}=8 \) 15. \( \mathrm{pH}=9.5 \)