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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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ercise 15.6 Formalin is an aqueous solution of formaldehyde, HCHO, used as a preservative for biologic specimens. How many grams of formaldehyde must be used to prepare 2.5 L of 12.3 M formalin?

Interpretation Introduction

Interpretation:

The mass of the formaldehyde required to prepare 2.5L of 12.3M formalin is to be calculated.

Concept Introduction:

The molarity of a solution is defined as the number of moles of solute dissolved in one liter of the solution. The formula for molarity is given as:

M=mMmV

Where,

  • m represents the mass of the solute.
  • V represents the volume of the solution.
  • Mm represents the molar mass of the solution.
Explanation

The required volume of 12.3M formalin is 2.5L.

The molar mass of formaldehyde is 30.031gmol1.

The molarity of a solution is given as:

M=mMmV

Where,

  • m represents the mass of the solute.
  • V represents the volume of the solution.
  • Mm represents the molar mass of the solution.

Rearrange the above equation for the value of m.

m=MMmV

Substitute the value of M, V and Mm in the above equation

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Chapter 15 Solutions

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