   Chapter 1, Problem 39RGQ

Chapter
Section
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,

Given:  10% solution , density = 1.0 g/mlCalculate mass in grams:_mass = density × volume =1.0 g/ml ×10% ml                                         = 0.1 gCalculate mass for 50%:_The solution 50% is  drawn from the solution containing 0

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