Practice Quiz 1 (Chapter 7)

After passage of a constant current for 45 min, 7.19 mg of silver (atomic weight = 107.9) was deposited from a solution of silver nitrate. Calculate the current.

• 0.0024 A

• 0.0543 A

• 0.0614 A

• 0.0052 A

The electrolytic conductivity of a 0.2 M solution of acetic acid was found to be 6.0×10^-4 S/cm. Calculate the molar conductivity.

• 3.0

• 5.3

• 2.0

• 4.2

The electrolytic conductivity 𝛋 varies with concentration.

• true

• false

for weak electrolytes, the molar conductivity falls only slightly as the concentration is raised.

• true

• false

"𝐴/𝑙" is called the cell constant

• true

• false

At 25 °C, the molar conductivity of acetic acid at infinite dilution is 388 𝑆. 𝑐𝑚².mol^-1. If the molar conductivity of a solution of acetic acid is 12 𝑆.𝑐𝑚².𝑚𝑜𝑙⁻¹, what’s the degree of dissociation of acetic acid in this solution?

• 3.1%

• 3.7%

• 2.5%

• 5.0%