Q: What is the $[\mathrm{H}^+]$ in a solution with a pH of $5.63$?

$2.34 \times 10^{-6}\,\mathrm{M}$

Question 1

Automobile batteries use $3.0\,\mathrm{M}\ \mathrm{H}_2\mathrm{SO}_4$ as an electrolyte. How much $1.20\,\mathrm{M}\ \mathrm{H}_2\mathrm{SO}_4$ will be needed to provide $225\,\mathrm{g}$ of battery acid? (Molar mass of $\mathrm{H}_2\mathrm{SO}_4 = 98.1\,\mathrm{g/mol}$)

Accepted Answer

$0.56\,\mathrm{L}$

Question 2

In the reaction $\mathrm{AgNO}_3(\mathrm{aq}) + \mathrm{Na}_2\mathrm{SO}_4(\mathrm{aq}) \rightarrow 2\mathrm{NaNO}_3(\mathrm{aq}) + \mathrm{Ag}_2\mathrm{SO}_4(\mathrm{s})$, what ions, if any, are spectator ions?

Accepted Answer

$\mathrm{Na}^+$, $\mathrm{NO}_3^-$

Question 3

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting $16.5\,\mathrm{g}$ of $\mathrm{CaCl}_2$ to $925.0\,\mathrm{mL}$. (Molar mass of $\mathrm{CaCl}_2 = 110.98\,\mathrm{g/mol}$)

Accepted Answer

$0.161\,\mathrm{M}$

Question 4

A $0.150\,\mathrm{M}$ sodium chloride solution is referred to as a physiological saline solution because its sodium ion concentration is similar to that in human blood. Calculate the mass of sodium chloride required to prepare $275.0\,\mathrm{mL}$ of a physiological saline solution. ($\mathrm{NaCl}$ molar mass $= 58.44\,\mathrm{g/mol}$)

Accepted Answer

$2.41\,\mathrm{g}$

Question 5

Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. A $0.417\,\mathrm{g}$ sample of terephthalic acid was subjected to combustion analysis and yielded $0.117\,\mathrm{g}$ of $\mathrm{H}_2\mathrm{O}$ and $1.02\,\mathrm{g}$ of $\mathrm{CO}_2$. If its molar mass is between $165$ and $167\,\mathrm{g/mol}$, what is its molecular formula?

Accepted Answer

$\mathrm{C}_{14}\mathrm{H}_{10}\mathrm{O}_4$

Question 6

Select the classification for the following reaction: $2\mathrm{NaClO}_3 + 2\mathrm{HCl} \rightarrow 2\mathrm{NaCl} + \mathrm{Cl}_2 + 3\mathrm{H}_2\mathrm{O}$

Accepted Answer

Redox

Question 7

Select the precipitate that forms when aqueous ammonium sulfate reacts with aqueous copper(II) nitrate.

Accepted Answer

$\mathrm{CuS}$

Question 8

What is the $[\mathrm{H}^+]$ in a solution with a pH of $5.63$?

Accepted Answer

$2.34 	imes 10^{-6}\,\mathrm{M}$

Question 9

Sulfur dioxide reacts with chlorine to produce thionyl chloride (used as a drying agent for inorganic halides) and dichlorine oxide (used as a bleach for wood, pulp, and textiles): $\mathrm{SO}_2(g) + 2\mathrm{Cl}_2(g) \rightarrow \mathrm{SOCl}_2(g) + \mathrm{Cl}_2\mathrm{O}(g)$. If $17.040\,\mathrm{mol}$ of $\mathrm{Cl}_2$ reacts with excess $\mathrm{SO}_2$, how many moles of $\mathrm{Cl}_2\mathrm{O}$ are formed?

Accepted Answer

$8.52\,\mathrm{mol}$

Question 10

A mixture of $2.49\,\mathrm{g}$ of aluminum ($M = 26.98\,\mathrm{g/mol}$) and $1.17\,\mathrm{g}$ of oxygen ($M = 32.00\,\mathrm{g/mol}$) is allowed to react. What mass of aluminum oxide ($\mathrm{Al}_2\mathrm{O}_3$) can be formed?

Accepted Answer

$3.74\,\mathrm{g}$

Question 11

Select the precipitate that forms when the following reactants are mixed: $\mathrm{Na}_2\mathrm{CO}_3(\mathrm{aq}) + \mathrm{BaCl}_2(\mathrm{aq})$

Accepted Answer

$\mathrm{BaCO}_3$

Question 12

Write the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid.

Accepted Answer

$\mathrm{OH}^-(aq) + \mathrm{H}^+(aq) \rightarrow \mathrm{H}_2\mathrm{O}(l)$

Question 13

What is the conjugate base of $\mathrm{HSO}_4^-$ in the reaction below? $\mathrm{CO}_3^{2-} + \mathrm{HSO}_4^- \rightarrow \mathrm{SO}_4^{2-} + \mathrm{HCO}_3^-$

Accepted Answer

$\mathrm{SO}_4^{2-}$

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