Question

What mass of each solute is present in 285 g of a solution that contains 5.00$\%$ by mass $\mathrm{NaCl}$ and 7.50$\%$ by mass $\mathrm{Na}_{2} \mathrm{CO}_{3} ?$

Name: Problem 16, Chapter 15: World of Chemistry
Uploaded: 2020-06-14T16:56:05-08:00
Duration: 2 min 19 s
Channel: Marissa Turner
Description: What mass of each solute is present in 285 g of a solution that contains 5.00% by mass NaCl and 7.50% by mass Na2 CO3 ?

   What mass of each solute is present in 285 g of a solution that contains 5.00$\%$ by mass $\mathrm{NaCl}$ and 7.50$\%$ by mass $\mathrm{Na}_{2} \mathrm{CO}_{3} ?$

World of Chemistry

Steven S.Zumdahl,… 1st Edition

Chapter 15, Problem 16

Instant Answer

Solved by Expert Marissa Turner

06/14/2020

Step 1

This is done by dividing the percentage by 100. For $\mathrm{NaCl}$, the mass percentage is 5.00$\%$, so the decimal form is $\frac{5.00}{100} = 0.05$. Similarly, for $\mathrm{Na}_{2} \mathrm{CO}_{3}$, the mass percentage is 7.50$\%$, so the decimal form is Show more…

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What mass of each solute is present in 285 g of a solution that contains 5.00$\%$ by mass $\mathrm{NaCl}$ and 7.50$\%$ by mass $\mathrm{Na}_{2} \mathrm{CO}_{3} ?$

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Key Concepts

Solution Composition

A solution is a homogeneous mixture composed of at least one solute dissolved in a solvent. Understanding the composition of a solution requires knowledge of the relative amounts of each component, which is often expressed in terms of mass percent, enabling precise control over chemical formulations and reactions.

Mass of Solute Calculation

Calculating the mass of a solute involves multiplying the total mass of the solution by the solute's mass fraction in decimal form. This process is a fundamental technique in quantitative chemistry for preparing solutions or analyzing their compositions.

Mass Percent Concentration

Mass percent concentration is a way to express the concentration of a solute in a solution by comparing the mass of the solute to the total mass of the solution, and then multiplying by 100 to yield a percentage. It is crucial for determining the exact quantity of solute present in any given mass of solution.

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