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Dilution and Solute Conservation 4 questions

Dilution and Solute Conservation

New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.

When only solvent is added, the amount of solute in the sample stays constant. Use M1V1 = M2V2, with both volumes in the same units.

Question 1

What is the concentration after 40.0 mL of 0.500 M solution is diluted to a final volume of 100.0 mL?

  1. 0.125 M
  2. 0.200 M
  3. 0.500 M
  4. 1.25 M

Question 2

What volume of 1.20 M stock solution is required to make 250. mL of 0.240 M solution? Show your setup.

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Question 3

Explain why a solute can have a lower molarity after dilution even though the number of solute particles stays the same.

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Question 4

Which volume should be used for V₂ when making a dilution?

  1. The final solution volume
  2. The original stock volume in its bottle
  3. The volume of pure solvent added
  4. The stock sample volume before dilution

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Dye Standards for a Colorimeter 4 questions

Dye Standards for a Colorimeter

Use the information below to answer the questions.

A class uses 0.120 M stock dye to make colorimeter standards. Each standard starts with a fresh sample from the same stock. The dye does not react with the solvent.

StandardStock sample (mL)Final solution (mL)
P10.060.0
Q15.060.0
R15.090.0

Question 5

Which standard has the greatest dye molarity?

  1. P
  2. Q
  3. R
  4. All have the same dye molarity.

Question 6

Calculate the dye molarity of standard R.

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Question 7

Do Q and R contain the same amount of dye in moles? Use the preparation data to explain.

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Question 8

Which pair has the same final molarity but different final volumes?

  1. P and Q
  2. P and R
  3. Q and R
  4. All three

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