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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