University:
High School
Course:
High School Chemistry
Academic year:

2019
Views:

83

Pages:

3
Author:

auransxj

Worksheet: Molarity Molarity: Abbreviated as "M" Description of solution concentration. Molarity = mol solute / Vol (L) Problems: Show all work and circle your final answer. To make a 4.00 M solution, how many moles of solute will be needed if 12.0 liters of solution are required? 1 M = mol / L 4.00 M = x mol / 12.0 L 48.0 mol = x How many moles of sucrose are dissolved in 250 mL of solution if the solution concentration is 0.150 M? M = mol / L 0.150 M = x mol / 0.250 L 0.038 mol = x What is the molarity of a solution of HNO₃ that contains 12.6 grams HNO₃ in 1.0 L of solution? mol = g / gfm mol = 12.6 g / 63 g/mol mol = 0.2 mol M = mol / L M = 0.2 mol / 1.0 L M = 0.2 mol/L How many grams of potassium nitrate are required to prepare 0.250 L of a 0.700 M solution? M = mol / L 0.700 M = x mol / 0.250 L 0.175 mol = x mol = g / gfm 0.175 mol = x g / 101 g/mol 17.7 g = x 5. 125 cm³ of solution contains 3.5 moles of solute. What is the molarity of the solution? 125 mL = 0.125 L M = mol / L = 3.5 mol / 0.125 L = 28.0 M 6. Which solution is more concentrated? Solution "A" contains 50.0 g of CaCO₃ in 500.0 mL of solution. Solution "B" contains 6.0 moles of H₂SO₄ in 4.0 L of solution. SHOW WORK! A CaCO₃: 40 + 12 + 48 = 100 g/mol mol = 50.0 g / 100 g/mol = 0.5 mol M = mol / L = 0.5 mol / 0.5 L = 1.0 M B H₂SO₄: 6.0 mol / 4.0 L = 1.5 M B is more concentrated 7. How many liters of solution can be produced from 2.5 moles of solute if a 2.0 M solution is needed? M = mol / L 2.0 M = 2.5 mol / x L x L * 2.0 M = 2.5 mol x L = 2.5 mol / 2.0 M = 1.25 L 8. What would be the concentration of a solution formed when 1.00 g of NaCl are dissolved in water to make 100.0 mL of solution? 1 NaCl: 23 + 35.5 = 58.5 g/mol mol = g / gfm = 1.00 g / 58.5 g/mol = 0.017 mol M = mol / L = 0.017 mol / 0.1 L = 0.17 M