Concentration
What concentration describes
What is how much solute is dissolved in a solvent
What happens to concentration when a solution is diluted?
It decreases
What is the solute?
The substance that is dissolved.
What is an aqueous solution?
A homogeneous mixture where a solute is dissolved into water.
Concentration compares the amount of what to the amount of solvent or total solution?
Solute
Which has a higher concentration: a solution with more solute per unit volume or less solute per unit volume?
More solute per unit volume.
During dilution, does the amount of solute change?
No, the amount of solvent increases.
What is the solvent?
The part of the solution in which the solute dissolves and that is present in the greatest amount.
What does it mean when a mixture is homogeneous?
Its components are evenly distributed throughout.
A solution contains 10 g of solute and 100 g of solution. What percentage of the solution is solute?
10%
Two 100 mL glasses contain water. Glass A has fewer solute particles than glass B. Which has the higher concentration?
Glass B
You have a concentrated solution and need to make it less concentrated. What should you add?
More solvent, such as water in this case.
In an aqueous solution, which substance is usually the solvent?
Water
What is saturation?
When a solvent can no longer dissolve any more solute.
A solution has 22 g of sugar in 227 g of liquid. The presentation gives its concentration as approximately what percentage?
10%
Solution A and solution B have the same amount of water. A has 2 g of solute and B has 8 g. Which is more concentrated and why?
B, because it has more solute in the same amount of solvent.
If the amount of solute stays the same while the amount of solvent increases, what happens to concentration?
It decreases
In a cup of hot chocolate, the cocoa powder is the solute. What is the solvent?
Water (or milk)
What is the difference between a saturated and unsaturated solution?
An unsaturated solution can dissolve more solute; a saturated solution contains as much solute as it can dissolve.
Solution A has 5 g of solute in 100 mL of solution. Solution B has 10 g in 100 mL. What is the ratio of A’s solute amount to B’s?
1:2
Two solutions have the same volume. Solution A contains 5 g of solute and solution B contains 15 g. How many times more concentrated is B based on the solute-to-volume comparison?
3 times
A solution contains a fixed amount of solute. You add more water without adding more solute. Explain what happens to the concentration and why.
The concentration decreases because the same amount of solute is spread through a greater amount of solvent.
A solution contains a substance dissolved in water. Which component is present in the greatest amount, and which component is the dissolved substance?
Water is the solvent; the dissolved substance is the solute.
What happens when additional solute is added to a saturated solution?
The additional solute remains undissolved because the solvent cannot dissolve any more.
A solution has 20 g of solute and 80 g of solvent. What is the solute-to-solvent ratio?
20:80 / 1:4