Concentrations of Solutions

Which formula will you use for a problem looking for the mass-volume concentration of NaCl in a solution?

To calculate the concentration of a solution, multiply the mass of the solute (grams) with the volume of solvent (mL).

• True

• False

Both of these solutions have a volume of 30 mL. Which solution is more concentrated?

• orange solution

• green solution

• they are equally concentrated

Which solution is more concentrated?

Solution 1:

20 mL of water

5 g of salt

Solution 2:

20 mL of water

10 g of salt

• Not enough information to tell

• Solution 1

• Solution 2

• They are equally concentrated

In order to dilute a solution, you need to

• add more of the solid

• add more water

• find the mass

• find the volume

Which solution is more diluted?

Solution 1:

1000 mL of water

60g of salt

Solution 2:

500 mL of water

60 g of salt

• Not enough information to tell

• Solution 1

• Solution 2

• They are equally diluted

The EASIEST way to determine which Koolaid solution is the most concentrated is to...

• compare their mass

• compare their color

• evaporate each solution

Tags

NGSS.MS-PS1-2

In order to compare the concentration of two solutions on a balance, the two solutions must have equal volumes.

• true

• false

Both solutions have equal volumes of 30 mL. Which solution is more diluted?

• Solution X

• Solution Y

Tags

NGSS.MS-PS1-2

The amount of solute actually dissolved in a given amount of solvent.

• dilution

• concentration

• saturated solution

• supersaturated mixture