Question

7. You need to prepare 250 mL of a 0.300 M aqueous solution of sucrose, C H20 (aq), which is used frequently in biological experiments. (pts each) A. Which type of glassware should you use to make this solution (assuming that the accuracy of the concentration is important)? 250ml B. What mass of sucrose would you use? Show work C. How should the solute and solvent be mixed in the container? a. Add solute and fill solvent to 250 mark? b. Add solvent to 250 mark and then add solute c. Add solute and a small amount of solvent dissolve solute and then take volume to 250 with solvent. Explain your choice.

Answer 1

A Volumetric Classware (Clasks) should be used to make this solution because volumetrie glasswares are calliberated at specific volume Hence they provide more acourate results than Beakers because Beakers are made to measure range of voluenes, so it has a greater uncertainity for acoracy. A 0-3004 aqueaus solution of sucrose ((12H22011) contains 0.300 moles per Litre, so moles in asome should be = 0.25oKx 0.300 More Because Molarity = (asome = 0.250 L) = 0.075 moles Moles Volume) mass of sucrose = Moles of sucrose & Moleculas weight = (0.075) * Molecular weight of Sucrose) Molecular weight g Sucrose = (12x12+1X22 + 1 X 16) ((12 H220) = 342 So, mass of sucrose - (0.875) × (342) = 25-65 grams use is Mass of sucrose that we would 25.65 grams