Unit 5 - Concentration

Question 1

Whats the equation for Concentration?

Answer 1

Concentration (M) = Moles (mols) / Volume (L)

Question 2

What is dm^3 equal to?

Answer 2

Liters

Question 3

What is cm^3 equal to?

Answer 3

Milliliters

Question 4

What is a solution?

Answer 4

A homogenous mixture consisting of a solute (substance being dissolved) and a solvent.

Question 5

What is concentration?

Answer 5

Relative amount of solution. (varies with temperature.)

Question 6

Whats the most common way to indicate concentration?

Answer 6

Molarity (M)

Question 7

What is Molarity?

Answer 7

(M) Determined by the moles of solute per volume in Liters of a solution.

Question 8

How do you convert mL to L?

Answer 8

Divide by 1000. (or move decimal place 3 digits to the left)

Question 9

What is the solubility curves X and Y axis?

Answer 9

x=temperature
y=grams of solute/ grams of solution

Question 10

What equation do you use if you have an unknown concentration or volume?

Answer 10

M2V2=M1V1

Question 11

What is the equation for molality?

Answer 11

Molality (m) = moles of solute / kg of solvent

Question 12

What does molality tell us?

Answer 12

The concentration of a solution expressed in the number of moles of solute per 1kg of solution.

Question 13

Why might you use molality?

Answer 13

Unlike Molarity it doesn’t vary with temperature.

Question 14

What are percent solutions?

Answer 14

The concentration of solutions
1. Ratio of volume of solute to volume of solution
2. Ratio of mass of solute to mass of solution