PRACTICE 1 (1).pdf

Phar Organic Lab Asst Prof. Akıle TUNCAL Dr. Gizem ŞANLITURK MOLARITY MOLARITY-MOLE You’ll need a grams to moles formula to find the moles of a substance you have. The gram to mol formula is: n= m/MW Preparing Solutions Solution...

Phar Organic Lab Asst Prof. Akıle TUNCAL Dr. Gizem ŞANLITURK MOLARITY MOLARITY-MOLE You’ll need a grams to moles formula to find the moles of a substance you have. The gram to mol formula is: n= m/MW Preparing Solutions Solutions are commonly prepared by - Using solid solute - Diluting a concentrated solution - When preparing a solution from solid solute, first use the molarity equation determine the mass of the solute required.  Steps Involved in Preparing Solutions from Solids - Calculate the amount of solid required - Mass out the solid - Place in an appropriate volumetric flask - Fill flask about half full with water and mix. - Fill to the mark with water and invert to mix. Preparing a Solution from Solid Solute QUESTION 1: An experiment calls for 250 mL of a 0.10 M NaCl (saline) solution. How many grams of solid NaCl are required to make the solution? Explain how you would create this solution. (NaCl=58,44 g/mol) Preparing a Solution from Solid Solute QUESTION 2: How many grams of glucose is required to prepare 500 mL of 0.04 M glucose solution? Explain how you would create this solution. (Glucose: C₆H₁₂O₆) (C=12g, H=1g, O=16g)