Chapter 1, Problem 39RGQ

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The anesthetic procaine hydrochloride is often used to deaden pain during dental surgery. The compound is packaged as a 10.% solution (by mass; d = 1.0 g/mL) in water. If your dentist injects 0.50 mL of the solution, what mass of procaine hydrochloride (in milligrams) is injected?

Interpretation Introduction

Interpretation: The mass of procaine hydrochloride in milligrams has to be given,

Concept Introduction:

The mass percentage of compound can be calculated by taking the calculated mass of the substance to the total mass of the sample whole multiplied by 100.

The mass percent can be calculated with formula,

Masspercent(inpercentage)=Calculatedmass(ingrams)totalmass(ingrams)×100

Explanation

The mass of procaine hydrochloride is calculated as,

â€‚Â Given:Â Â 10%Â solutionÂ ,Â densityÂ =Â 1.0Â g/mlCalculateÂ massÂ inÂ grams:_massÂ =Â densityÂ Ã—Â volumeÂ =1.0Â g/mlÂ Ã—10%Â mlÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â =Â 0.1Â gCalculateÂ massÂ forÂ 50%:_TheÂ solutionÂ 50%Â isÂ Â drawnÂ fromÂ theÂ solutionÂ containingÂ 0

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