Map You need to prepare 250. mL of a 0.900 M aqueous solution of sucrose, Cet220

Question

Map You need to prepare 250. mL of a 0.900 M aqueous solution of sucrose, Cet220t(aq), which is used frequently in biological experiments. A Which type of glassware should you O use to make this solution (assuming that the accuracy of the concentration is important)? 250 ml -150 100 50 200 150 100 250 mL How should the correct amount of solute be obtained? O Measure out x mol of solid sucrose on a molemeter. O Measure out x of sucrose with a ruler. O Measure out xg of solid sucrose on a balance. Now that you have selected the correct unit above, what is the value of x? Number x= How should the solute and solvent be mixed in the container? O Mix a small amount of water with the solute to dissolve it, then fill with water to the 250-mL mark 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

Explanation / Answer

1. C)

Beakers are used primarily for crudely measuring out large volumes of liquids, mixing reagents and carrying out chemical reactions. The graduated markings on a beaker are only approximate, so a beaker should never be used for accurate volume measurements. Graduated cylinders are specifically designed to measure out liquid volumes. Their tall narrow design makes for a more precise reading of the liquid level. If more precision is needed, a volumetric flask can be used. These flasks typically measure a single volume via a single mark on a tall narrow neck. These flasks are generally used for solution preparation.

2. C)

Dissolve particular amount of solute in grams into the solvent. Then find out theoretically number of moles added.

3.

x = 0.9 x (250/1000) x 342.3

x = 77.0175 g

4. A)

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