SOLUTION CONCENTRATION

Question 1

Expressed Qualitatively

Answer 1

• Less solute dissolved, more solvent.

Question 2

• Concentrated solution

Answer 2

• More solute dissolved, less solvent.

Question 3

Expressed Quantitatively

Answer 3

• Percent by mass — % mass = mass of solute/mass of solution x 100
• Percent by volume — % vol. = volume of solute/volume of solution x 100
• Percent by m/v — % m/v = mass of solute/volume of solution x 100

Question 4

STEPS TO SOLVING A PROBLEM

Answer 4

1. Given - Identify the amount of solute and solvent
2. Required - Identify what is being solved
3. Equations - Identify the equation needed
4. Solution - Substitutes the values into the equation and perform the indicated expressions
5. Answer - Express your answer in 2 decimal places and briefly describes it

ALWAYS make sure that there are two numbers after the decimal point.

ALWAYS make sure that there are two numbers after the decimal point.
- Is this in two decimal places?
1 = 1.81 + 1.99 = 3.8 ➡️ Add a 0 next to the last decimal place 3.80

Question 5

Solubility

Answer 5

• The ability of the solute to dissolve in a given amount of solvent
• Solubility of a solute changes when the conditions change

Question 6

Factors affecting solubility

Answer 6

1. Temp.
   - Solubility varies as temperature changes.

• Solids:
• Higher temp, greater solubility
  Gases:
• Higher temp. lesser solubility in water.

2. Surface area
   - Grinding large solids into smaller pieces increases their surface area

• Greater surface area, faster rate of dissolution.

3. Stirring

• Speeds up dissolution process
• More interaction between water and solute particles resulting in faster dissolution.

4. Pressure

• The greater the pressure, the higher the amount of gas that can be dissolved in a liquid.

5. The mature of the solute of solvent

• Innate chemical properties of the substances to be mixed
• “Like dissolves like”