Molarity and Dilutions

How do we make a dilution?

• Add more solute

• Remove solute

• Remove solvent

• Add more solvent

The definition of a stock solution is ...

• a highly concentrated solution that is meant to be diluted to some lower concentration.

• moles of solute divided by liters of solvent

• a solution used to make soup and is usually either chicken or beef flavor

• a solution with less dissolved solute than a dilute solution.

The term molar, which describes a solution's concentration, is written as?

• M

• mol

• g

• g/L

You can make a solution more concentrated by adding __________.

• solute

• solvent

• water

Tags

NGSS.HS-PS1-5

What is the molarity of 4 g of NaCl (MM=58.45g/mol) in 3,800 mL of solution?

• 0.018 M

• 0.0011 M

• 1.052 M

• 0.062 M

How many grams of AgNO₃ are needed to prepare 0.125M solution in 250 mL of water? (MM 169.87g/mol)

• .03g

• 0.5g

• 5.3g

• 84.9g

Calculate the Molarity in a solution containing 40.0 g of NaCl dissolved in 500.0 ml of H2O.

• 0.08 M

• 12.5 M

• 1.37 M

• 0.74 M

Find the molarity of 186.55 g of sucrose, C₁₂H₂₂O₁₁ (MM = 342) in 250 mL of water.

• 2.18 M

• 0.746 M

• 1.18 M

• 0.545 M

How many grams of calcium hydroxide are needed to produce 500. ml of 1.66 M calcium hydroxide solution?
 (M = mol solute/ L solution)

• 38.7 g

• 61.5 g

• 94.0 g

• 19.7 g

Tags

NGSS.HS-PS1-7

If you have 34 mL of a 0.5 M NaBr solution, what will the concentration be if 56 mL of water is added to it?

• .191 M

• 3.78 M

• .389 M

• 1.76 M