You need to prepare 250. mL of a 0.600 M aqueous solution of sucrose, CoHzOaq),

Question

You need to prepare 250. mL of a 0.600 M aqueous solution of sucrose, CoHzOaq), which is used frequently in biological experiments Which type of glassware should you O A use to make this solution (assuming O B that the accuracy of the concentration is important)? O C 250 mL 200 m 100 100 200 150 100 How should the correct amount of solute be obtained? O O Measure out x cm of sucrose with a ruler. Measure out x g of solid sucrose on a balance. Measure out x mol of solid sucrose on a molemeter. Now that you have selected the correct unit above, what is the value of x? 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 Add the solute, then fill the container to the 250-mL mark with water C) Mix a small amount of water with the solute to dissolve it, then fil with water to the 250-mL mark ) NextEril iation G Check Answer O Previous G v, Upd. VieN

Explanation / Answer

In order to prepare 250 mL of the solution we use 250.0 mL standard flask(C)

So Flask C is correct.

Measure out x g of solid sucrose on a balance

Number of moles of sucrose , n = Molarity x volume in L

= 0.600 M x 250 mL x ( 10-3 L/mL)

= 0.15 moles

Molar mass of sucrose (C12H22O11) is = ( 12*12)+(22*1)+(11*16) = 342 g /mol

So mass of sucrose , x = number of moles x molar mass

= 0.15 mol x 342 (g/mol)

= 51.3 g

Mix a small amount of water with the solute to dissolve it , then fill with water to the 50 mL mark

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