Domanda del libro di testo
The precipitation of Al(OH)3 (Ksp) = 1.3⨉10-33) is sometimes used ot purify water. (a) Estimate the pH at which precipitation of Al(OH)3 will begin if 5.0 lb of Al2(SO4)3 is added to 2000 gal of water
1648
views
Ch.18 - Chemistry of the Environment
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Capitolo 18, Problema 92
The pH of a particular raindrop is 5.6.
(a) Assuming the major species in the raindrop are H2CO3(aq), HCO3-(aq) and CO32- (aq), Calculate the concentrations of these species in the raindrop, assuming the total carbonate concentration is 1.0 * 10-5 M. The appropriate Ka values are given in Table 16.3.
(b) What experiments could you do to test the hypothesis that the rain also contains sulfur-containing species that contribute to its pH? Assume you have a large sample of rain to test.
Guida verificata passo dopo passo1
Step 1: Understand the problem and identify the given data. The pH of the raindrop is 5.6, and the total carbonate concentration is 1.0 \(\times\) 10^{-5} \(\text{ M}\). The species involved are \(\text{H}\)_2\(\text{CO}\)_3, \(\text{HCO}\)_3^-, and \(\text{CO}\)_3^{2-}.
Step 2: Use the pH to find the concentration of \(\text{H}\)^+ ions. Since \(\text{pH}\) = -\(\log\)[\(\text{H}\)^+], rearrange to find [\(\text{H}\)^+] = 10^{-\(\text{pH}\)}.
Step 3: Use the given \(\text{K}\)_a values for the dissociation of \(\text{H}\)_2\(\text{CO}\)_3 to \(\text{HCO}\)_3^- and \(\text{HCO}\)_3^- to \(\text{CO}\)_3^{2-}. Set up equilibrium expressions for each dissociation step using the \(\text{K}\)_a values.
Step 4: Apply the mass balance equation for the total carbonate concentration: [\(\text{H}\)_2\(\text{CO}\)_3] + [\(\text{HCO}\)_3^-] + [\(\text{CO}\)_3^{2-}] = 1.0 \(\times\) 10^{-5} \(\text{ M}\).
Step 5: Solve the system of equations from the equilibrium expressions and the mass balance to find the concentrations of \(\text{H}\)_2\(\text{CO}\)_3, \(\text{HCO}\)_3^-, and \(\text{CO}\)_3^{2-}.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
8mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
pH and Acid-Base Chemistry
pH is a measure of the hydrogen ion concentration in a solution, indicating its acidity or basicity. A pH of 7 is neutral, while values below 7 indicate acidity and above 7 indicate basicity. In this context, a pH of 5.6 suggests the presence of acidic species, such as carbonic acid (H2CO3), which dissociates to release H+ ions, affecting the overall pH of the raindrop.
Video consigliato:
Percorso guidato
02:39
pH of Strong Acids and Bases
Equilibrium and Ka Values
The acid dissociation constant (Ka) quantifies the strength of an acid in solution, representing the equilibrium between the undissociated acid and its ions. For the carbonate system, the relevant Ka values help determine the concentrations of H2CO3, HCO3-, and CO32- at a given pH. By applying the Henderson-Hasselbalch equation and the provided Ka values, one can calculate the concentrations of these species in the raindrop.
Video consigliato:
Percorso guidato
00:59Ka values of Diprotic Acids
Experimental Methods for Analyzing Rain Composition
To investigate the presence of sulfur-containing species in rain, various analytical techniques can be employed, such as ion chromatography or mass spectrometry. These methods can detect and quantify ions like sulfate (SO4^2-) and bisulfate (HSO4-) that may influence the rain's pH. Additionally, titration experiments can help assess the acidity contributed by these species, providing insight into their role in the overall chemical composition of the rain.
Video consigliato:
Percorso guidato
05:50Experimental Error
Pratica correlata
Domanda del libro di testo
The Henry's law constant for CO2 in water at 25 °C is 3.1x10^-2 M atm-1. (a) What is the soubility of CO2 in water at this temperature if the soltuion is in contact with air at normal atmospheric pressure?
13366
views
Domanda del libro di testo
The valuable polymer polyurethane is made by a condensa- tion reaction of alcohols (ROH) with compounds that con- tain an isocyanate group (RNCO). Two reactions that can generate a urethane monomer are shown here: (i)
(ii)
(c) If you wanted to promote the formation of the isocyanate intermediate in each reaction, what could you do, using Le Châtelier's principle?
380
views
Domanda del libro di testo
The pH of a particular raindrop is 5.6. (b) What experiments could you do to test the hypothesis that the rain also contains sulfur-containing species that contribute to its pH? Assume you have a large sample of rain to test.
314
views