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Module 4: Liquid Characteristics - Types of Liquids - Practice Problems
- Instructions:
- Work these problems on a sheet of paper and check your answers against those provided below.
-
#1
- Match the liquids on the left with their correct type on the right.
-
- Answer: i. b. Aqueous liquid
- Liquid (i) is an aqueous liquid because it consists only of liquids,
one of which is water.
- Answer: ii. c. Slurry
- Liquid (ii) is a slurry because its concentration of suspended solids
by weight is within the range of 2-30%.
-
- Answer: iii. b. Aqueous liquid
- Liquid (iii) is an aqueous liquid because the weight of suspended
solids is less than 2% and the weight of dissolved species is less than
15%.
-
- Answer: iv. d. Ionic solution
- Liquid (iv) is an ionic solution because the concentration of dissolved species by weight exceeds 15%.
-
#2
- A liquid is added to a packed
bed scrubber. The liquid consists of two feed streams. Stream 1
consists of water with essentially no suspended or dissolved solids.
Stream 2 consists of water with 20% by weight of suspended solids. If
95% of the weight of the scrubbing
liquid comes from Stream 1 and the balance from Stream 2, how would
you classify the resulting liquid entering the scrubber?
- City water
- Aqueous liquid
- Slurry
- Ionic solution
- City water
-
- Answer: b. Aqueous liquid
- Solution:
- Solve the problem on a 100 lbm basis of liquid entering the scrubber.
- Calculate the number of pounds force of scrubbing liquid contributed
by Stream 1 and the amount contributed by Stream 2.
- Calculate the amount of suspended solids contributed by Stream 2.
Twenty percent of Stream 2 by weight consists of suspended solids.
- Categorize the type of liquid entering the packed bed scrubber.
A liquid with 1% suspended solids by weight is called an aqueous liquid.
-
#3
- Based only on the appearance of the liquids shown below, answer the following questions. The solvent in each case is water.
- Which beaker(s) may contain city water?
- Which beaker(s) may contain aqueous liquid?
- Which beaker(s) may contain a slurry?
- Which beaker(s) may contain an ionic solution?
-
- Answer: i. Beaker A
- Beaker A may contain city water. Since city water contains such low
levels of solids, the liquid always appears clear.
-
- Answer: ii. Beakers A, B, C, and D
- Beakers A, B, C, and D may contain an aqueous liquid since the turbidity
of aqueous liquids can vary from 0 to essentially 100%. If the liquid
contains dissolved solids then the liquid may appear clear as in Beaker
A. Aqueous liquids contain 0.2 - 2.0% suspended solids by weight. If
the liquid contains up to 2% suspended solids by weight, the turbidity,
which increases with the percentage of suspended solids, could approach
100%. Therefore, Beakers B, C and D could contain aqueous liquids.
-
- Answer: iii. Beaker D
- The liquid in Beaker D may contain a slurry. Since slurries are composed
of a very high level of suspended solids (greater than 2% by weight),
the liquid is opaque (100% turbidity).
-
- Answer: iv. Beaker A
- The liquid in Beaker A may contain an ionic solution. Since ionic solutions contain dissolved solids (many being ions), the liquid appears clear.