Use the direct addition method. Use the References to access important values if

Question

Use the direct addition method. Use the References to access important values if needed for this question. A student wishes to prepare 500-mL of a 0.188 M sodium acetate solution using solid sodium acetate, a 500-mL volumetric flask, and deionized water (a) How many grams of sodium acetate must the student weigh out? b) Which of the following would NOT be an expected step in the procedure used by the student? O Carefully transfer the salt sample to the volumetric flask. O Add 500 mL of deionized water to the flask. OCarefully add water until the bottom of the meniscus sits on the mark on the neck of the flask. Check & Submit Answer Show Approach

Explanation / Answer

a)Molar mass of Sodium acetate=82.0343g/mol

Strength of sodium acetate=.188M

Molarity=moles of solute/liters of solution

Molarity=.188M

liters of solution=.5L

moles of sodium acetate required=.094

1 mol sodium acetate=82.0343g sodium acetate

so,.094 mol sodium acetate=7.711g sodium acetate

The student mush weigh out 7.711g sodium acetate.

b)The solid solute is weighed out on a weighing paper on in a small container and then transferred directly to a volumetric flask.A small quantity of solvent is then added to volumetric flask and the contents are swirled gently until the substance is completely dissolved.More solvent is added until the meniscus of the liquid reaches the calibration mark on the neck of the volumetric flask.

so,Not an expected step is Add 500 mL of deionized water to the flask.

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