Question 5: Find the mass in grams of sodium hydroxide that will be required to prepare a solution with a concentration of 0.500 mol·dm⁻³ in a 250 cm³ volumetric flask. [Round the answer to three decimal places. Do not type in the unit. Use a decimal point.] * The concentration of the solution prepared in Question 5 is only approximate because sodium hydroxide is not a primary standard. * A- True B- False
Question 5: Find the mass in grams of sodium hydroxide that will be required to prepare a solution with a concentration of 0.500 mol·dm⁻³ in a 250 cm³ volumetric flask. [Round the answer to three decimal places. Do not type in the unit. Use a decimal point.] * The concentration of the solution prepared in Question 5 is only approximate because sodium hydroxide is not a primary standard. * A- True B- False
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question 5: Find the mass in grams of sodium hydroxide that will be required to prepare a solution with a concentration of 0.500 mol·dm⁻³ in a 250 cm³ volumetric flask. [Round the answer to three decimal places. Do not type in the unit. Use a decimal point.] *
The concentration of the solution prepared in Question 5 is only approximate because sodium hydroxide is not a primary standard. *
A- True
B- False
Expert Solution
Step 1
From the definition of molarity (M),
Here the solute is NaOH (molar mass = 40 grams)
Molarity of the solution = mass of the solute*1000/(molar mass of the solute * volume in mL)
0.500 = mass of the solute *1000/(40*250)
mass of the NaOH = 5.0 grams
mass of the solute needed to prepare 250 mL of a 0.500 M aqueous solution is 5.0 grams
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