Unit 3: % Comp, EF, MF, Molarity & Dilution Quiz

What is the starting molarity of a 250 mL solution if it was diluted to a 0.5 M solution of 850 mL?

• 2.2 M

• 3.5 M

• 1.7 M

• 0.15 M

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

• 0.018 M

• 0.0011 M

• 0.062 M

• 1.052 M

How many grams of solute are dissolved in 125.0 mL of 5.00 M NaCl (MM = 58.45)?

How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?

• 62.7 mol

• 0.069 mol

• 1074 mol

• 1.07 mol

True or False? The higher the concentration of a solution the less solutes it has in it.

• False

• True

Tags

NGSS.HS-PS1-5

How many moles of AgNO are needed to prepare 0.125M solution in 250 mL of water?

• 0.03125 mol

• 2.5 mol

• 31.25 mol

• 0.500 mol

Tags

NGSS.HS-PS1-7

If you started with 20 L of 12 M HCl, what is the final molarity if you diluted it to have a volume of 65 L?

If you started with 360 mL of 7.42 M HF, what would be the final concentration if you were to add 640 mL to the stock solution?

If you started with 790 mL of 5.0 stock solution, what would be the final volume, in liters, of the final solution at 1.8 M?

• 2.194 L

• 0.2194 L

• 2194 L

• 21.94 L

When you are diluting a solution, what are you adding into it?

• Solute

• Solution

• Solvent

• Moles