Dilution Problems Worksheet 1. How do you prepare a 250.-ml of a 2.35 M HF dilution from a 15.0 M stock solution? (include a worded explanation) 2. If 455-ml of 6.0 M HNO3 is used to make a 2.5 L dilution, what is the molarity of the dilution? 3. If 65.5 ml of HCl stock solution is used to make 450.-ml of a 0.675 M HCl dilution, what is the molarity of the stock solution? 4. How do you prepare 500.-ml of a 1.77 M H2SO4 dilution from an 18.0 M H2SO4 stock solution? (include a worded explanation) Extra Molarity Problems for Practice 5. How many moles of LiF would be required to produce a 2.5 M solution with a volume of 1.5 L? 6. How many moles of Sr(NO3) 2 would be used in the preparation of 2.50 L of a 3.5 M solution? 7. What is the molarity of a 500-ml solution containing 249 g of KI? 8. How many grams of CaCl2 would be required to produce a 3.5 M solution with a volume of 2.0 L? Answers: 1.1 M 3.00 M 7.8 x 102 g 3.75 M 4.64 M 8.75 M 39.2 mL 49.2 mL Dilutions Worksheet 1) If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be? 2) If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be? 3) How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl? 4) I have 345 mL of a 1.5 M NaCl solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be? 5) How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution? Answers: 0.100M 0.125M 2.07 M 700mL 50,000mL

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