BACE Percentage Solutions

Percentage Solutions

BACE Prep

Using solid or powdered solutes, you can create solutions based on relative masses.


E.g. 25% NaCl = 25g NaCl in 100g of solution.
If water is your solvent, you can assume it weighs 75g here, so you'd need 75mL of water.

wt/wt solutions

Percentage Solutions

Using pure liquid solutes, you can create solutions based on relative volumes.


E.g. 10% ethanol solution = 10mL pure ethanol dissolved in 90mL pure water.

vol/vol solutions

Percentage Solutions

Math Response

How many mL of acetone is needed to create 100mL of a 60% (vol/vol) solution?

Type answer here

Correct Answer: 60

Deg^°

Rad

Math Response

How many mL of acetone is needed to create 1L of a 5% (vol/vol) solution?

Type answer here

Correct Answer: 50

Deg^°

Rad

Math Response

How many mL of acetone is needed to create 2.5L of a 5% (vol/vol) solution?

Type answer here

Correct Answer: 125

Deg^°

Rad

Grams of solute per 100mL water.
(Assumes water, which is 1g/mL.)

E.g. 10% glucose solution has 10g glucose dissolved in 100mL water.

wt/vol solutions

Percentage Solutions

Math Response

A 10% (wt/vol) solution of glycine (MW 75 Da) is prepared. How many grams of glycine are required to make 100mL of this solution?

Type answer here

Correct Answer: 10

Deg^°

Rad

Math Response

A 10% (wt/vol) solution of glycine (MW 75 Da) is prepared. How many grams of glycine are required to make 1 liter of this solution?

Type answer here

Correct Answer: 100

Deg^°

Rad

Math Response

1 liter of a 10% (wt/vol) solution of glycine (MW 75 Da) is prepared. What is the molarity of this solution? (Use 2 decimal places.)

Type answer here

Correct Answer: 1.33

Deg^°

Rad