Ma You need to prepare 250. mL of a 0.900 M aqueous solution of sucrose, CuHz0n(

Question

Ma You need to prepare 250. mL of a 0.900 M aqueous solution of sucrose, CuHz0n(aq), which is used frequently in biological experiments. Which type of glassware should you O A use to make this solution (assuming that the accuracy of the concentra is important)? 200 mt 200 100 O O O Measure out x mol of solid sucrose on a molemeter. Measure out x cm of sucrose with a ruler. Measure out x g of solid sucrose on a balance. Now that you have selected the correct unit above, what is the value of x7 Number How should the solute and solvent be mixed in the container? O Fill the continer with water to the 250-mL mark, then add the solute. O Mix a small amount of water with the solute to dissolve it, then fill with water to the 250-mL mark. O Add the solute, then fill the container to the 250-mL mark with water.

Explanation / Answer

Q1.

ignore A, the beaker, since it will not even ahve 250 mL mark

ignore B --> this ism ostly used in titrations

Use C --> this is used in diluition, and precise measurement of vol ume

Q2.

sine we are talking about amount of substance ( moleS) we can only relate via mass

therefore, measure "x" grams of solid sucorse in the balance

Q3

if

M = mol/V

then

mol = MV = 0.9*0250 = 0.225 mol of sucgose required

mass = mol*MW = 0.225*342.2965 = 77.01671 g must be measured

Q3

Add the solid first, then add volume up to V = 250 mL

note that solid might change amount of volume so avoid adding last the solid

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