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For more information, please see full course syllabus of Physical Science
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Lecture Comments (10)

1 answer

Last reply by: Professor Ebs
Fri Jan 17, 2014 8:52 PM

Post by Yisrael Harris on January 9, 2014

How does oil compare to water as a solvent?

0 answers

Post by Yisrael Harris on January 9, 2014

Is there always a correlation between rate of solution and solubility?

1 answer

Last reply by: Professor Ebs
Wed May 1, 2013 11:48 AM

Post by Yisrael Harris on April 28, 2013

When you dissolve, say, sugar, in water, is each sugar molecule now completely separate from every other sugar molecule?

1 answer

Last reply by: Yisrael Harris
Sun Apr 28, 2013 12:24 AM

Post by Yisrael Harris on April 28, 2013

Carbonated water seems different from the other solutions, since you can actually say the carbonated bubbles, so how do we call it a solution?

2 answers

Last reply by: Professor Ebs
Wed May 1, 2013 11:46 AM

Post by Nathanael Shim on December 3, 2012

Why do things dissolve?

Related Articles:

Solutions, Acids, and Bases

  • A solution is a homogeneous mixture where the components of the mixture are evenly mixed.
  • In a solution, one substance, the solute is dissolved into another substance, the solvent.
  • The movement of molecules causes the solute to break apart and mix evenly throughout the solvent.
  • Liquids and gases dissolve easily. Solid alloy solutions must be melted for dissolving to occur.
  • A liquid dissolves a solid at the surface of the solid.
  • Since water is a polar molecule, it works well as a solvent. A solution where water is the solvent is called an aqueous solution.
  • Agitation, size of particles and temperature can affect the rate of dissolving.
  • Solubility is the maximum amount of solute that can be dissolved in a certain amount of solvent.
  • Solubility is affected by the types of solutes and solvents, temperature, and pressure.
  • The amount of solute dissolved into the solvent is the concentration of the solution.
  • The pH scale is the measure of H+ in a solution. The scale ranges from 0 to 14; a pH less than 7 is an acid, 7 is neutral, and greater than 7 is a base.

    Acids and bases react together to form salt and water

Solutions, Acids, and Bases

A solute and a solvent combine to make a ______.
Solution
What type of mixture is a solution?
A homogeneous mixture.
What do you call a solution when water is the solvent?
An aqueous solution
What can you do to a chunk of rock salt in order for the salt to dissolve faster?
Heat, crush, and/or stir.
Changing the solutes, solvents, temperature or pressure will affect the ______ of a solution.
Solubility
Which solution has a higher concentration: 2 L of water combined with 20g of salt or 2L of water combined with 40g of salt?
2L of water with 40g of salt
If a substance has a pH of 6, is it an acid, a base, or neutral?
The substance is a weak acid
What is formed in the chemical reaction between an acid and a base?
Salt and water
Why does water make an excellent solvent?
The slight charges that exist in polar molecules of water help to attract tiny pieces of the solute and allow them to break off from the solute faster (dissolves faster)
Liquid mercury is dissolved by solid sodium to form a solution. Identify the solute and the solvent.
Mercury is the solute and sodium is the solvent.

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

Answer

Solutions, Acids, and Bases

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Solutions 0:06
    • Definition of Solution
    • Solute and Solvent
    • Example: Salt Water
    • Example: Carbonated Water
  • Dissolving 1:49
    • Dissolving
    • Example: Liquid Dissolves a Solid at the Surface of the Solid
    • Aqueous Solutions: Water as Solvent
  • Increasing the Rate of Dissolving 5:33
    • Stir
    • Crush
    • Heat
  • Solubility 8:31
    • Definition of Solubility
    • Compare the Solubility of Sugar in Water vs. Salt in Water
    • Factors that Affect Solubility
  • Concentration 12:45
    • Concentration
  • pH Scale 15:21
    • pH Scale: Acids, Neutral, and Bases
  • Acids and Bases 18:01
    • Chemical Properties
    • Physical Properties
    • pH Scale
    • Examples of Acids and Bases
    • Acids and Bases React Together to Form Salt and Water
  • Example 1: Identify the Solutes and Solvents for the Following Solutions 21:26
  • Example 2: Temperature and the Rate of Dissolving/Solubility of a Solid 23:57
  • Example 3: How Can You Make a Solution Have a Higher Concentration? 25:44
  • Example 4: Acids and Bases 27:57