   Chapter 15.3, Problem 15.2SC ### Introductory Chemistry: A Foundati...

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

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
54 views

# ercise 15.2 What mass of water must be added to 425 g of formaldehyde to prepare a 40.0 (by mass) solution of formaldehyde? This solution, called formalin, is used to preserve biological specimens.

Interpretation Introduction

Interpretation:

The mass of water added in 425g of formaldehyde to prepare 40.0% (by mass) solution is to be calculated.

Concept Introduction:

The mass percentage of a compound present in a solution is calculated by dividing the mass of the compound present in the mixture by the total mass of the solution and then multiplying it by 100. The formula for mass percentage is represented as:

mass%=MMt×100%

Where,

• M represents the mass of the compound present in the solution.
• Mt represents the total mass of solution.
Explanation

The mass of the formaldehyde is 425g.

The required mass percentage of the formaldehyde in the solution is 40.0%.

The mass percentage of a solute in an aqueous solution is given as:

mass%=MM+Mw×100%

Where,

• M represents the mass of the compound present in the solution.
• Mw represents the mass of water.

Rearrange the above equation for the value of Mw.

Mw=100%mass%1M

Substitute the value of M and mass percentage of formaldehyde in the above equation

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