Molarity and Dilutions Worksheet Key

University:
Western Oregon University
Course:
CH150 | Preparatory Chemistry
Academic year:

2023
Views:

77

Pages:

2
Author:

banksjama61p

Molarity and Dilutions Worksheet KEY 𝑀= 𝑛 𝑉 N= #moles V must be in liters (change if necessary) 1. What is the molarity of a 0.30 liter solution containing 0.50 moles of NaCl? 1.7M 2. Calculate the molarity of 0.289 moles of FeCl3 dissolved in 120 ml of solution? 2.41 M 3. If a 0.075 liter solution contains 0.0877 moles of CuCO4, what is the molarity? 1.2M 4. How many moles of NaCl are present in 600. ml a 1.55 M NaCl solution? .930 moles 5. How many moles of H2SO4 are present in 1.63 liters of a 0.954 M solution? 1.56 molse 6. How many liters of solution are needed to make a 1.66 M solution containing 2.11 moles of KMnO4? 1.27 g 7. What volume of a 0.25 M solution can be made using 0.55 moles of Ca(OH)2? 2.2 L For all of the problems below you will need to do a mole-mass conversion. Each problem will involve two steps. 8. What is the molarity in 650. ml of solution containing 63 grams of NaCl? 1.7 M 9. How many grams of Ca(OH)2 are needed to produce 500. ml of 1.66 M Ca(OH)2 solution? 61.5 g 10. What volume of a 0.88 M solution can be made using 130. grams of FeCl2? 1.2 L 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? 39.2 mL 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? 1.1 M 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? 4.64 M 4. How do you prepare 500.-ml of a 1.77 M H2SO4 dilution from an 18.0 M H2SO4 stock solution? Take 49.2-ml of 18.0 M H2SO4 stock solution and pour it into a 500-ml volumetric flask. Fill to the 500-ml line with distilled water to make 1.77M H2SO4 solution. Extra Molarity Problems for Practice 1. How many moles of LiF would be required to produce a 2.5 M solution with a volume of 1.5 L? 3.75 M 2. How many moles of Sr(NO3)2 would be used in the preparation of 2.50 L of a 3.5 M solution? 8.75 M 3. What is the molarity of a 500-ml solution containing 249 g of KI? 3.00 M 4. How many grams of CaCl2 would be required to produce a 3.5 M solution with a volume of 2.0 L? 777 g