Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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A chemist prepares a solution of aluminum sulfite \((\text{Al}_2(\text{SO}_3)_3)\) by measuring out 179. \(\mu\text{mol}\) of aluminum sulfite into a 300. mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in \(\text{mmol/L}\) of the chemist's aluminum sulfite solution. Be sure your answer has the correct number of significant digits.

A box labeled with the unit \(\frac{\text{mmol}}{L}\) is provided. A calculator interface is shown with options for clear, reset, and help.
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Transcribed Image Text:A chemist prepares a solution of aluminum sulfite \((\text{Al}_2(\text{SO}_3)_3)\) by measuring out 179. \(\mu\text{mol}\) of aluminum sulfite into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in \(\text{mmol/L}\) of the chemist's aluminum sulfite solution. Be sure your answer has the correct number of significant digits. A box labeled with the unit \(\frac{\text{mmol}}{L}\) is provided. A calculator interface is shown with options for clear, reset, and help.
Expert Solution
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Step 1Introduction

Molarity

  • It is defined as the number of moles of a substance dissolved in 1 litre of a solution. 
  • It is used to describe the concentration of a solution. 

 

Moles: 

Number of moles =Weight in grams/Molecular Weight                               

 

Step 2 Interpretation of information given in the question

According to the question 

 

  • A chemist prepares a solution of Aluminum sulfite solution by dissolving 179 µmoles of Aluminum sulfite in 300 ml of water. 
  • 179 µmoles is equal to 0.000179 moles or 0.179 mmoles 
  • Weight in grams=Number of moles*Molecular Weight                               = 0.000179*342.15                               = 0.0612 gms/300 ml of water
  • It means the chemist has dissolved 0.0612 grams of Aluminum sulfite in 300 ml of water.

 

 

 

 

 

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