Textbook Question
A laboratory procedure calls for making 100.0 mL of a 1.30 M K2SO4 solution. What mass of K2SO4 (in g) is needed?
Ch.5 - Introduction to Solutions and Aqueous Solutions
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
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Table of contents
- Ch.1 - Matter, Measurement & Problem Solving90
- Ch.2 - Atoms & Elements94
- Ch.3 - Molecules and Compounds103
- Ch.4 - Chemical Reactions and Chemical Quantities46
- Ch.5 - Introduction to Solutions and Aqueous Solutions65
- Ch.6 - Gases100
- Ch.7 - Thermochemistry85
- Ch.8 - The Quantum-Mechanical Model of the Atom51
- Ch.9 - Periodic Properties of the Elements79
- Ch.10 - Chemical Bonding I: The Lewis Model70
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory68
- Ch.12 - Liquids, Solids & Intermolecular Forces44
- Ch.13 - Solids & Modern Materials42
- Ch.14 - Solutions77
- Ch.15 - Chemical Kinetics88
- Ch.16 - Chemical Equilibrium57
- Ch.17 - Acids and Bases121
- Ch.18 - Aqueous Ionic Equilibrium126
- Ch.19 - Free Energy & Thermodynamics80
- Ch.20 - Electrochemistry87
- Ch.21 - Radioactivity & Nuclear Chemistry61
- Ch.22 - Organic Chemistry114
Chapter 5, Problem 27a
How many moles of KCl are contained in each solution? a. 0.556 L of a 2.3 M KCl solution
Verified step by step guidance1
Determine the formula for calculating moles from molarity and volume: \( \text{moles} = \text{molarity} \times \text{volume} \)
Identify the given values: Molarity (M) = 2.3 M, Volume (L) = 0.556 L
Substitute the given values into the formula: \( \text{moles} = 2.3 \text{ M} \times 0.556 \text{ L} \)
Perform the multiplication to find the number of moles of KCl.
Ensure the units are consistent and the final answer is in moles.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molarity (M)
Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in moles per liter (mol/L) and is crucial for understanding how much solute is present in a given volume of solution. In this question, the molarity of the KCl solution is given as 2.3 M, indicating that there are 2.3 moles of KCl in every liter of solution.
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Molarity Concept
Calculating Moles from Molarity
To find the number of moles of solute in a solution, you can use the formula: moles = molarity × volume. This relationship allows you to calculate the total moles of solute when you know the concentration and the volume of the solution. In this case, you would multiply the molarity of the KCl solution by the volume in liters to determine the moles of KCl present.
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Volume Conversion
Volume must be in liters when using the molarity formula, as molarity is defined per liter of solution. If the volume is given in milliliters or another unit, it must be converted to liters to ensure accurate calculations. In this question, the volume of the KCl solution is given as 0.556 L, which is already in the correct unit for the calculation.
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