联系我们： 手动添加方式: 微信>添加朋友>企业微信联系人>13262280223 或者 QQ: 1483266981

CHEM352/354 – 2023-2024 – CS WORKSHOP 03
QUESTION 1: Arachidic acid has an area per molecule of 0.19 nm2. Calculate the molar
surface area and the surface pressure f/l of a close-packed monolayer in a Langmuir
trough.
_________________________________________________________________________
QUESTION 2: Calculate the gravitational acceleration on the top of Mount Everest
knowing that the capillary rise of water in a capillary of radius 500 um (assume perfect
wetting, = °) is 29.7 mm. For the sake of simplicity, you’re doing the experiment in a
heated tent (25 °C) and the surface tension of water = .
_________________________________________________________________________
QUESTION 3: The molar conductivity of a 10 mM solution of acetic acid is 1.36

. Using data from the table below, calculate the degree of dissociation
of acetic acid and use the value of α to calculate pKa for acetic acid.
Molar Conductivity at Infinite Dilution
Hydrochloric acid 37.8 Ω
1
cm2mol 1
Sodium Acetate 7.6 Ω
1
cm2mol 1
Sodium Chloride 12.2 Ω
1
cm2mol 1
_________________________________________________________________________
QUESTION 4: How much Copper is electroplated on a metallic electrode if 30A are
passed through an electrolytic cell containing in water for 2 hours Copper has
atomic weight of 63.546 u.
_________________________________________________________________________
QUESTION 5: Ethylene glycol has a surface tension of 47.7 mN/m and a density of
1.097 g/cm3
.
(i) Calculate its contact angle on a glass substrate assuming the surface-air interfacial
energy is 0.479 N/m and the liquid-surface interfacial energy is 0.448 N/m.
(ii) Having calculated the contact angle, estimate the capillary rise in a glass tube 0.5
mm diameter.