교과서 질문
To what volume should you dilute 50.0 mL of a 3.00 M KI solution so that 25.0 mL of the diluted solution contains 2.55 g of KI?
Ch.14 - Solutions
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
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Table of contents
- Ch.1 - Matter, Measurement & Problem Solving118
- Ch.2 - Atoms & Elements106
- Ch.3 - Molecules and Compounds131
- Ch.4 - Chemical Reactions and Chemical Quantities56
- Ch.5 - Introduction to Solutions and Aqueous Solutions82
- Ch.6 - Gases114
- Ch.7 - Thermochemistry96
- Ch.8 - The Quantum-Mechanical Model of the Atom60
- Ch.9 - Periodic Properties of the Elements90
- Ch.10 - Chemical Bonding I: The Lewis Model89
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory85
- Ch.12 - Liquids, Solids & Intermolecular Forces51
- Ch.13 - Solids & Modern Materials47
- Ch.14 - Solutions90
- Ch.15 - Chemical Kinetics115
- Ch.16 - Chemical Equilibrium68
- Ch.17 - Acids and Bases136
- Ch.18 - Aqueous Ionic Equilibrium153
- Ch.19 - Free Energy & Thermodynamics93
- Ch.20 - Electrochemistry106
- Ch.21 - Radioactivity & Nuclear Chemistry74
- Ch.22 - Organic Chemistry140
14장, 문제 63
A hard water sample contains 0.0085% Ca by mass (in the form of Ca2+ ions). How much water (in grams) contains 1.2 g of Ca? (1.2 g of Ca is the recommended daily allowance of calcium for adults between 19 and 24 years old.)
검증된 단계별 안내1
Identify the percentage of calcium in the water sample, which is given as 0.0085% by mass.
Understand that this means there are 0.0085 grams of calcium in every 100 grams of water.
Set up a proportion to find out how many grams of water contain 1.2 grams of calcium. Use the relationship: (0.0085 g Ca / 100 g water) = (1.2 g Ca / x g water).
Solve the proportion for x, which represents the mass of water that contains 1.2 grams of calcium.
Rearrange the equation to solve for x: x = (1.2 g Ca * 100 g water) / 0.0085 g Ca.
주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Mass Percentage
Mass percentage is a way of expressing the concentration of a component in a mixture. It is calculated by taking the mass of the component, dividing it by the total mass of the mixture, and multiplying by 100. In this question, the mass percentage of calcium in hard water is given as 0.0085%, which indicates that for every 100 grams of hard water, there are 0.0085 grams of calcium.
추천 영상:
가이드 코스
00:38
Mass Percent Calculation
Stoichiometry
Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. In this context, stoichiometry helps us determine how much water is needed to contain a specific mass of calcium. By using the mass percentage of calcium, we can set up a proportion to find the total mass of water required to achieve the desired amount of calcium.
추천 영상:
가이드 코스
01:16Stoichiometry Concept
Conversion of Units
Conversion of units is essential in chemistry to ensure that measurements are compatible and calculations yield accurate results. In this problem, we need to convert the mass of calcium (1.2 g) into the corresponding mass of hard water using the mass percentage. Understanding how to convert between grams of calcium and grams of water is crucial for solving the problem correctly.
추천 영상:
가이드 코스
01:56Conversion Factors
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