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Serial Dilutions Worksheet with Answer Key, Exercises of Chemistry

Everett Community College worksheet on dilutions

Typology: Exercises

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Dilutions Worksheet
W 329
Everett Community College
Student Support Services Program
1) If 45 mL of water are added to 250 mL of a 0.75 M K2SO4 solution, what will the
molarity of the diluted solution be?
2) If water is added to 175 mL of a 0.45 M KOH solution until the volume is 250 mL, what
will the molarity of the diluted solution be?
3) How much 0.075 M NaCl solution can be made by diluting 450 mL of 9.0 M NaCl?
4) If 550 mL of a 3.50 M KCl solution are set aside and allowed to evaporate until the
volume of the solution is 275 mL, what will the molarity of the solution be?
5) How much water would need to be added to 750 mL of a 2.8 M HCl solution to make a
1.0 M solution?
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Dilutions Worksheet

W 329

Everett Community College Student Support Services Program

  1. If 4 5 mL of water are added to 250 mL of a 0. 7 5 M K 2 SO 4 solution, what will the molarity of the diluted solution be?
  2. If water is added to 1 75 mL of a 0. 4 5 M KOH solution until the volume is 2 50 mL, what will the molarity of the diluted solution be?
  3. How much 0.0 7 5 M NaCl solution can be made by diluting 4 50 mL of 9.0 M NaCl?
  4. If 550 mL of a 3 .5 0 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 2 75 mL, what will the molarity of the solution be?
  5. How much water would need to be added to 75 0 mL of a 2. 8 M HCl solution to make a 1.0 M solution?

Dilutions Worksheet – Solutions

  1. If 45 mL of water are added to 250 mL of a 0. 7 5 M K 2 SO 4 solution, what will the molarity of the diluted solution be? (0.75 M)(250 mL) = M 2 (295 mL) M 2 = (0.75 M)(250 mL) = 0.64 M (295 mL)
  2. If water is added to 1 75 mL of a 0. 4 5 M KOH solution until the volume is 2 50 mL, what will the molarity of the diluted solution be? (0. 4 5 M)( 175 mL) = M 2 (2 50 mL) M 2 = (0. 4 5 M)( 175 mL) = 0.32 M (2 50 mL)
  3. How much 0.0 7 5 M NaCl solution can be made by diluting 4 50 mL of 9.0 M NaCl? (9.0 M)( 450 mL) = (0.075 M)V 2 V 2 = (9.0 M)( 450 mL) = 54,000 mL = 54 L (0.075 M)
  4. If 550 mL of a 3 .5 0 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 2 75 mL, what will the molarity of the solution be? (3.50 M)( 550 mL) = M 2 (2 75 mL) M 2 = (3.50 M)( 550 mL) = 7.0 M ( 275 mL)
  5. How much water would need to be added to 75 0 mL of a 2. 8 M HCl solution to make a 1.0 M solution? (2.8 M)( 750 mL) = (1.0 M)V 2 V 2 = (2.8 M)( 750 mL) = 2100 mL = 2.1 L (This is the volume of solution) (1.0 M) To find how much H 2 O should be added: 2.1L - .750L = 1.35L