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UWM Compounds in Solutions Strong Electrolytes & Aqueous Solution Lab Report

UWM Compounds in Solutions Strong Electrolytes & Aqueous Solution Lab Report

Question Description

Lab Report

Compounds in Solutions

Pre-lab questions:

1. Define the following terms: (3 x 0.5 ea = 1.5 pts)

a) strong electrolyte

b) weak electrolyte

c) nonelectrolyte

2. Briefly explain: (2 pts)

a) what does it mean when we say a molecule is polar?

b) what does it mean when we say a molecule is nonpolar?

Part 1: Electrolytes. Click to watch the video below, record observations and answer questions.

Electrolytes (Links to an external site.)Electrolytes

Observations and conclusions: Fill in the table: (0.25 pt ea.)

Name of each substance tested

Chemical formula of

the substance

Is the substance ionic or covalent?

Brightness of light bulb:

bright, dim or no light?

Is the substance:

strong electrolyte,

weak electrolyte,

or nonelectrolyte?

pure water
table salt
table sugar
hydrochloric acid
acetic acid

Questions:

Our body fluids such as blood and sweat have dissolved ions,

a) list four major types of ions in our body fluids; (1 pt)

b) in your opinion, are our body fluids strong, weak or nonelectrolytes? (1 pt)

Part 2: Polarity of common substances: Watch the video below, record observations and answer questions.

Like dissolves like (Links to an external site.)Like dissolves like

Observations and conclusions: Fill in the table. (0.25 pt ea.)

Name of substances

Solubility in water:

Is the substane soluble or insoluble in water?

Solubility in oil:

Is the substance soluble or insoluble in oil?

Is the substance polar or nonpolar?
water N/A
food colorings
coke
table salt
table sugar
oil N/A
acetone
cyclohexane
iodine

Questions:

1. In a few sentences explain what it means by “like dissolves like”. (1 pt)

2. A common vitamin in milk is found to be soluble in cyclohexane (cyclohexane is a substance tested in the video), but insoluble in water.

a) Is this vitamin a polar molecule or nonplolar molecule? (0.5 pt)

b) Explain. (1.5 pt)


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