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THE MOLE

THE MOLE. Molarity January 14, 2009 (adapted from Mrs. J’s website). Very Important to Know!. 1000 ml = 1 L g/1 mol = molar mass = priodic table Multiply  subscripts = yes Coefficients = NO. substance being dissolved. total combined volume. A. Molarity.

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THE MOLE

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  1. THE MOLE Molarity January 14, 2009 (adapted from Mrs. J’s website)

  2. Very Important to Know! • 1000 ml = 1 L • g/1 mol = molar mass = priodic table • Multiply  subscripts = yes Coefficients = NO

  3. substance being dissolved total combined volume A. Molarity • Concentration of a solution.

  4. A. Molarity 2M HCl What does this mean?

  5. MASS IN GRAMS MOLES NUMBER OF PARTICLES LITERS OF SOLUTION B. Molarity Calculations 6.02  1023 (particles/mol) molar mass (g/mol) Molarity (mol/L)

  6. Steps for Solving Molarity problems • Measure the mass or the mass will be given (in grams – g). This is the solute. • Determine the molar mass of the solute. • Where do you find molar mass? • What are the units and per how many moles? • Calculate the moles of the solute. • Add the water. This is the solvent and is also the volume of the molarity calculation. • Solute from step 1 dissolved insolvent from step 4 = solution • measurement’s final unit needs to be in Liters! • Molarity = mol solute / Liters of solution or M = mol / L

  7. M = B. Molarity Calculations • Find the molarity of a 250 mL solution containing 10.0 g of NaF. 10.0 g 1 mol 41.99 g = 0.238 mol NaF 0.238 mol 0.25 L = 0.95M NaF

  8. B. Molarity Calculations • How many grams of NaCl are required to make 0.500L of 0.25M NaCl? 0.500 L 0.25 mol 1 L 58.44 g 1 mol = 7.3 g NaCl

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