Q: A solution of crystal violet has an absorbance of 0.41 at 590 nm. If the molar absorptivity is $$87,000\ \mathrm{L\ $$mol^{-1}$$\ cm$$^{-1}$$}$$ and the path length is 1 cm, what is the concentration of crystal violet?

$$4.7 \times 10$$^{-6}$$\ \mathrm{M}$$

Question 1

Which of the following compounds is classified as a strong electrolyte when dissolved in water?

Accepted Answer

NaCl

Question 2

Which of the following substances will NOT dissolve in water according to the solubility rules provided?

Accepted Answer

AgCl

Question 3

A student dissolves 6.0 moles of HCl in 1.0 L of water. What is the molarity of the solution?

Accepted Answer

$$6.0\ \mathrm{M}$$

Question 4

Which of the following is a correct net ionic equation for the precipitation reaction between aqueous solutions of AgNO\_3 and NaCl?

Accepted Answer

$$\mathrm{Ag}^+ (aq) + \mathrm{Cl}^- (aq) \rightarrow \mathrm{AgCl} (s)$$

Question 5

Which of the following acids is classified as a strong acid?

Accepted Answer

HNO\_3

Question 6

What is the oxidation number of chromium in $$\mathrm{Cr}_2\mathrm{O}_7$$^{2-}$$?

Accepted Answer

$$+6$$

Question 7

A solution has a hydronium ion concentration of $$[\mathrm{H}_3\mathrm{O}^+] = 1.0 	imes 10$$^{-4}$$\ \mathrm{M}. $$What is the pH of this solution?

Accepted Answer

$$4.0$$

Question 8

Which of the following best describes a neutralization reaction?

Accepted Answer

A reaction in which an acid and a base react to form water and a salt.

Question 9

If 75.0 mL of 0.350 M HCl reacts with excess Na\_2CO\_3, what mass of CO\_2 (in grams) is produced? (Molar mass of CO\_2 = 44.01 g/mol)

Accepted Answer

$$0.578\ \mathrm{g}$$

Question 10

Which of the following is a correct statement about strong and weak acids?

Accepted Answer

Strong acids completely dissociate in water, while weak acids only partially dissociate.

Question 11

A student needs to prepare 30.0 mL of a 3.00 M CuCl\_2 solution. How many grams of CuCl\_2 (molar mass = 134.45 g/mol) are required?

Accepted Answer

$$4.03\ \mathrm{g}$$

Question 12

Which of the following is the correct formula for the net ionic equation of the reaction between HCl and NaOH?

Accepted Answer

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

Question 13

A solution of crystal violet has an absorbance of 0.41 at 590 nm. If the molar absorptivity is $$87,000\ \mathrm{L\ $$mol^{-1}$$\ cm$$^{-1}$$}$$ and the path length is 1 cm, what is the concentration of crystal violet?

Accepted Answer

$$4.7 	imes 10$$^{-6}$$\ \mathrm{M}$$

Question 14

Which of the following best describes a redox (oxidation-reduction) reaction?

Accepted Answer

A reaction in which electrons are transferred from one atom to another.

Question 15

What is the pH of a solution with $$[\mathrm{H}^+] = 2.5 	imes 10$$^{-2}$$\ \mathrm{M}$$?

Accepted Answer

$$1.60$$

Question 16

Which of the following is a correct statement about the solubility of ionic compounds in water?

Accepted Answer

Compounds containing alkali metal ions or ammonium are always soluble.

Question 17

A student mixes 50.0 mL of 0.200 M NaOH with 50.0 mL of 0.200 M HCl. What is the pH of the resulting solution?

Accepted Answer

$$7.0$$

Question 18

Which of the following is the correct oxidation number for oxygen in H\_2O\_2 (hydrogen peroxide)?

Accepted Answer

$$-1$$

Question 19

Which of the following best describes the relationship between absorbance and concentration according to Beer-Lambert Law?

Accepted Answer

Absorbance is directly proportional to concentration.

Aqueous Solutions: Classification, Solubility, and Electrolytes

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