Chapter 4: Q4.57P (page 180)

A mixture of bases can sometimes be the active ingredient in antacid tablets. If 0.4826 g of a mixture of ${Al(OH)}_{3}$ and $Mg {(OH)}_{2}$ is neutralized with 17.30 mL of 1.000 M ${HNO}_{3},$ what is the mass % of ${Al(OH)}_{3}$ in the mixture?

Short Answer

Expert verified

The mass % of $Al {(OH)}_{3}$ in the mixture is 55.93%

Step by step solution

Write down the molecular equation

Balanced molecular equation:

$Al {(OH)}_{3} + Mg {(OH)}_{2} (s) + 5 {HNO}_{3} \to Al {({NO}_{3})}_{3} + Mg {({NO}_{3})}_{2} + 5 H_{2} O (l)$

Calculate the mass of Al(OH)3

$\begin{matrix} {number of moles of HNO}_{3} = 1 mol/l×17.3ml× \frac{1l}{1000ml} \\ =0.0173mole \end{matrix}$

$mole ratio = \frac{1 moleAl {(OH)}_{3}}{5 {molesHNO}_{3}} = \frac{1}{5}$

Number of moles of $Al {(OH)}_{3}$ that reacted with $0.0173 moles$ of ${HNO}_{3}$ is calculated below.

$\begin{matrix} Number of molesof Al {(OH)}_{3} = 0.0173 \times \frac{1}{5} \\ = 0.00346 \end{matrix}$

$\begin{matrix} Mass of 1 mole Al {(OH)}_{3} = 78.01 g \\ Mass of 0.00346 mole Al {(OH)}_{3} = 78.01 g \times 0.00346 \\ = 0.2699 g \end{matrix}$

Determine the mass % of Al(OH)3

The mass percent of ${Al(OH)}_{3} :$

$\begin{matrix} mass % of Al {(OH)}_{3} & = & \frac{mass of Al {(OH)}_{3}}{total mass of mixture of Al {(OH)}_{3} and Mg {(OH)}_{2}} \times 100 % \\ = & \frac{0.2699 gmAl {(OH)}_{3}}{0.4826 gm} x 100 % \\ = & 55.93 % \end{matrix}$

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A mixture of bases can sometimes be the active ingredient in antacid tablets. If 0.4826 g of a mixture of ${Al(OH)}_{3}$ and $Mg {(OH)}_{2}$ is neutralized with 17.30 mL of 1.000 M ${HNO}_{3},$ what is the mass % of ${Al(OH)}_{3}$ in the mixture?

Short Answer

Step by step solution

Write down the molecular equation

Calculate the mass of Al(OH)3

Determine the mass % of Al(OH)3

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A mixture of bases can sometimes be the active ingredient in antacid tablets. If 0.4826 g of a mixture of Al(OH)3and Mg(OH)2is neutralized with 17.30 mL of 1.000 M HNO3,what is the mass % ofAl(OH)3in the mixture?

Short Answer

Step by step solution

Write down the molecular equation

Calculate the mass of Al(OH)3

Determine the mass % of Al(OH)3

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Making Measurements

Kinetics

The Earths Atmosphere

Chemical Analysis

Chemical Reactions

Nuclear Chemistry

Study anywhere. Anytime. Across all devices.

A mixture of bases can sometimes be the active ingredient in antacid tablets. If 0.4826 g of a mixture of ${Al(OH)}_{3}$ and $Mg {(OH)}_{2}$ is neutralized with 17.30 mL of 1.000 M ${HNO}_{3},$ what is the mass % of ${Al(OH)}_{3}$ in the mixture?