Answered: A stock solution of Na2B having a…

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.104QE: A 10.00-mL sample of a 24.00% solution of ammonium bromide (NH4Br) requires 23.41 mL of 1.200 molar...

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A stock solution of Na2B having a concentration of 0.1486 M is used to prepare four calibration standards, A-D in the table below, by diluting the indicated volume of this solution to a total volume of 50.00 mL. Complete the table by entering the molarity of B2- for each standard solution. Show an illustrative calculation for tube ‘A’. Use the dilution formula and express each result to one more digit than allowed by applying the rules of significant figures.

Calibration standards
A stock solution of Na2B having a concentration of 0.1486 M is used to prepare four calibration
standards, A-D in the table below, by diluting the indicated volume of this solution to a total
volume of 50.00 mL.
Complete the table by entering the molarity of B²- for each standard solution. Show an
illustrative calculation for tube 'A'. Use the dilution formula and express each result to one more
digit than allowed by applying the rules of significant figures.
Volume of stock B2-
solution taken, mL
1.00
Molarity of dilute B2-
solution, M
Standard
Absorbance
A
0.152
В
2.00
0.231
4.00
0.468
D
8.00
0.855
Construct a graph of Absorbance vs. molarity of B2 in Excel using the data in the preceding
table. Make certain to title the graph and include axes labels with proper units. Absorbance is
dimensionless (has no unit). Add a linear trendline to the graph but do not set the y-intercept to

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