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)?

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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?

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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?

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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