   # Douglasite is a mineral with the formula 2KC1 FeCl 2 2H 2 O. Calculate the mass percent of douglasite in a 455.0-mg sample if it took 37.20 mL of a 0.1000- M AgNO 3 solution to precipitate all the Cl − as AgCl. Assume the douglasite is the only source of chloride ion. ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 6, Problem 109AE
Textbook Problem
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## Douglasite is a mineral with the formula 2KC1 FeCl2 2H2O. Calculate the mass percent of douglasite in a 455.0-mg sample if it took 37.20 mL of a 0.1000-M AgNO3 solution to precipitate all the Cl− as AgCl. Assume the douglasite is the only source of chloride ion.

Interpretation Introduction

Interpretation: The mass percent of douglaiste has to be calculated.

Concept Introduction: The mass percentage of sample can be calculated by taking the calculated mass of the sample to the total mass of the sample whole multiplied by 100.

Masspercenatge(in%)=Calculatedmass(in grams)Totalmass(in grams)×100

### Explanation of Solution

Explanation

The total mass of the sample with the volume and molarity of silver nitrate has to be recorded as shown above

To calculate the mass of douglaiste

Molar mass of douglaiste= 311.88gram

Mass of douglaiste

= 0.037200.1000molAg+L×1molCl-molAg+×1moldouglasite4molCl-×311.88gdouglasitemol

= 0.2900gramdouglaiste

The mass of douglaiste was calculated by plugging the volume and molarity values of silver nitrate solution with molar mass of douglaiste. One mole of douglaiste contains 4Chlorine ions. Therefore, the mass of douglaiste is 0

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