Domanda del libro di testo
What are the molarity and the normality of a solution made by dissolving 25 g of citric acid (triprotic, C6H5O7H3) in enough water to make 800 mL of solution?
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Ch.10 Acids and Bases
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 10, Problema 99b
The dissociation of water into H3O+ and OH– ions depends on temperature. At 0 °C the [H3O+] = 3.38 x 10–8 M, at 25 °C the [H3O+] = 1.00 x 10–7 M, and at 50 °C the [H3O+] = 2.34 x 10–7 M.
b. What is the value of Kw at 0 °C and 50 °C?
Guida verificata passo dopo passo1
Step 1: Recall the expression for the ionization constant of water, K_w, which is defined as the product of the concentrations of hydronium ions ([H₃O⁺]) and hydroxide ions ([OH⁻]). Mathematically, K_w = [H₃O⁺] × [OH⁻].
Step 2: Understand that water is neutral, meaning the concentrations of [H₃O⁺] and [OH⁻] are equal at any given temperature. Therefore, [OH⁻] = [H₃O⁺].
Step 3: Substitute the given values of [H₃O⁺] at 0 °C and 50 °C into the formula for K_w. For 0 °C, [H₃O⁺] = 3.38 × 10⁻⁸ M, so K_w = (3.38 × 10⁻⁸ M) × (3.38 × 10⁻⁸ M). For 50 °C, [H₃O⁺] = 2.34 × 10⁻⁷ M, so K_w = (2.34 × 10⁻⁷ M) × (2.34 × 10⁻⁷ M).
Step 4: Perform the multiplication for each temperature to find the value of K_w. For 0 °C, multiply (3.38 × 10⁻⁸) by itself. For 50 °C, multiply (2.34 × 10⁻⁷) by itself.
Step 5: Express the final values of K_w for both temperatures in scientific notation, ensuring the units are in M² (molar squared) since K_w is a product of two molar concentrations.
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Dissociation of Water
The dissociation of water refers to the process where water (H₂O) separates into hydronium ions (H₃O⁺) and hydroxide ions (OH⁻). This equilibrium is crucial for understanding acid-base chemistry and is influenced by temperature, as the concentrations of these ions change with thermal conditions.
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Percorso guidato
02:06
Acid and Base Strength Concept 1
Ion Product of Water (K_w)
The ion product of water, denoted as K_w, is the equilibrium constant for the dissociation of water. It is defined as the product of the concentrations of H₃O⁺ and OH⁻ ions in pure water. K_w varies with temperature, and its value at 25 °C is 1.0 x 10⁻¹⁴, serving as a reference point for calculating ion concentrations at different temperatures.
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01:37Solubility Product Constant (Ksp) Concept 2
Temperature Dependence of K_w
K_w is temperature-dependent, meaning its value changes with temperature variations. As temperature increases, the dissociation of water becomes more favorable, leading to higher concentrations of H₃O⁺ and OH⁻ ions, thus increasing K_w. Understanding this relationship is essential for calculating K_w at different temperatures, such as 0 °C and 50 °C.
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01:30Temperature (Simplified) Concept 1
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Domanda del libro di testo
The dissociation of water into H3O+ and OH– ions depends on temperature. At 0 °C the [H3O+] = 3.38 x 10–8 M, at 25 °C the [H3O+] = 1.00 x 10–7 M, and at 50 °C the [H3O+] = 2.34 x 10–7 M.
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