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Questions and Answers
The electron-pair arrangement of ozone, O3, is ___ and the molecular geometry is ___.
The electron-pair arrangement of ozone, O3, is ___ and the molecular geometry is ___.
tetrahedral, bent
Which of the following is not a strong acid in aqueous solution?
Which of the following is not a strong acid in aqueous solution?
What is the pH of a 0.07 M solution of KOH?
What is the pH of a 0.07 M solution of KOH?
12.85 ± 0.02
Classify CsOH as a type of acid or base.
Classify CsOH as a type of acid or base.
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Give the conjugate base of H3PO4.
Give the conjugate base of H3PO4.
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Which of the following acids has the strongest conjugate base?
Which of the following acids has the strongest conjugate base?
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Use a table of Ka or Kb values to determine whether Kc for the reaction OH- + CH3OH ⇌ H2O + CH3O- is less than, equal to or greater than 1.
Use a table of Ka or Kb values to determine whether Kc for the reaction OH- + CH3OH ⇌ H2O + CH3O- is less than, equal to or greater than 1.
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Consider the reaction H3PO4(aq) + HSO4- ⇌ H2PO4-(aq) + H2SO4(aq). Determine the size of Kc.
Consider the reaction H3PO4(aq) + HSO4- ⇌ H2PO4-(aq) + H2SO4(aq). Determine the size of Kc.
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Calculate the pH of a 0.20 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).
Calculate the pH of a 0.20 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).
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Calculate the pH of a 0.400 M solution of propanoic acid, for which the Ka value is 1.30 x 10-5.
Calculate the pH of a 0.400 M solution of propanoic acid, for which the Ka value is 1.30 x 10-5.
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Is an aqueous solution of NH4Cl acidic, basic or neutral?
Is an aqueous solution of NH4Cl acidic, basic or neutral?
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What is the pH of 0.354 M trimethylammonium iodide, (CH3)3NHI?
What is the pH of 0.354 M trimethylammonium iodide, (CH3)3NHI?
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Calculate the pH of a 0.50 M solution of sodium acetate (NaCH3COO).
Calculate the pH of a 0.50 M solution of sodium acetate (NaCH3COO).
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Use VSEPR theory to predict the molecular geometry of the bromate ion, BrO3-.
Use VSEPR theory to predict the molecular geometry of the bromate ion, BrO3-.
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Which of the following is not a strong acid in aqueous solution?
Which of the following is not a strong acid in aqueous solution?
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What is the pH of a 0.284 M solution of HBr?
What is the pH of a 0.284 M solution of HBr?
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Classify H2Se as a type of acid or base.
Classify H2Se as a type of acid or base.
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Match each substance with the correct designation for the reaction equation H2O + HS- ⇌ OH- + H2S.
Match each substance with the correct designation for the reaction equation H2O + HS- ⇌ OH- + H2S.
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Which of the following acids has the weakest conjugate base?
Which of the following acids has the weakest conjugate base?
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Use a table of Ka or Kb values to determine whether Kc for the reaction NH4+ + HCO3- ⇌ H2CO3 + NH3 is less than, equal to or greater than 1.
Use a table of Ka or Kb values to determine whether Kc for the reaction NH4+ + HCO3- ⇌ H2CO3 + NH3 is less than, equal to or greater than 1.
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Consider the reaction H3SbO4(aq) + HTeO4- ⇌ H2SbO4-(aq) + H2TeO4(aq). Determine the size of Kc.
Consider the reaction H3SbO4(aq) + HTeO4- ⇌ H2SbO4-(aq) + H2TeO4(aq). Determine the size of Kc.
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Calculate the pH of a 0.50 M solution of ammonia (NH3, Kb = 1.8 x 10-5).
Calculate the pH of a 0.50 M solution of ammonia (NH3, Kb = 1.8 x 10-5).
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Calculate the pH of a 0.100 M solution of lactic acid, for which the Ka value is 1.40 x 10-4.
Calculate the pH of a 0.100 M solution of lactic acid, for which the Ka value is 1.40 x 10-4.
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Is an aqueous solution of NaCN acidic, basic or neutral?
Is an aqueous solution of NaCN acidic, basic or neutral?
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What is the pH of 0.58 M ethylammonium iodide, C2H5NH3I?
What is the pH of 0.58 M ethylammonium iodide, C2H5NH3I?
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Calculate the pH of a 0.10 M solution of sodium benzoate (NaC6H5COO).
Calculate the pH of a 0.10 M solution of sodium benzoate (NaC6H5COO).
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Use VSEPR theory to predict the electron-pair arrangement and molecular geometry of tetrahydroborate ion, BH4-.
Use VSEPR theory to predict the electron-pair arrangement and molecular geometry of tetrahydroborate ion, BH4-.
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Which of the following is not a strong acid in aqueous solution?
Which of the following is not a strong acid in aqueous solution?
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What is the pH of a 0.061 M solution of NaOH?
What is the pH of a 0.061 M solution of NaOH?
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Classify H2TeO4 as a type of acid or base.
Classify H2TeO4 as a type of acid or base.
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Give the conjugate base of HPO32-.
Give the conjugate base of HPO32-.
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Which of the following acids has the weakest conjugate base?
Which of the following acids has the weakest conjugate base?
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Use a table of Ka or Kb values to determine whether Kc for the reaction OH- + CH3OH ⇌ H2O + CH3O- is less than, equal to or greater than 1.
Use a table of Ka or Kb values to determine whether Kc for the reaction OH- + CH3OH ⇌ H2O + CH3O- is less than, equal to or greater than 1.
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Consider the reaction HOCl(aq) + ClO3-(aq) ⇌ OCl-(aq) + HClO3(aq). Determine the size of Kc.
Consider the reaction HOCl(aq) + ClO3-(aq) ⇌ OCl-(aq) + HClO3(aq). Determine the size of Kc.
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Calculate the pH of a 0.40 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).
Calculate the pH of a 0.40 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).
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Calculate the pH of a 0.100 M solution of benzoic acid, for which the Ka value is 6.50 x 10-5.
Calculate the pH of a 0.100 M solution of benzoic acid, for which the Ka value is 6.50 x 10-5.
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Is an aqueous solution of CuCl2 acidic, basic or neutral?
Is an aqueous solution of CuCl2 acidic, basic or neutral?
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What is the pH of 0.51 M diethylammonium chloride, (C2H5)2NH2Cl?
What is the pH of 0.51 M diethylammonium chloride, (C2H5)2NH2Cl?
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Calculate the pH of a 0.20 M solution of sodium formate (NaHCOO).
Calculate the pH of a 0.20 M solution of sodium formate (NaHCOO).
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Study Notes
VSEPR Theory & Molecular Geometry
- Ozone (O3) exhibits tetrahedral electron-pair arrangement with a bent molecular geometry.
- Bromate ion (BrO3-) has a trigonal-pyramidal molecular geometry according to VSEPR theory.
- Tetrahydroborate ion (BH4-) shows a tetrahedral electron-pair arrangement and molecular geometry.
Acids and Bases
- HClO2 is identified as a weak acid in aqueous solution, unlike the other strong acids listed (HI, HBr, HCl, HNO3).
- The conjugate base of H3PO4 is H2PO4-.
- The strongest conjugate base among the given options is NH3.
- An aqueous solution of NH4Cl is classified as acidic (A), while NaCN and KCN are classified as basic (B).
pH Calculations
- The pH of a 0.07 M KOH solution is approximately 12.85.
- For a 0.20 M solution of aniline (C6H5NH2), the pH is calculated to be 8.94.
- A 0.400 M solution of propanoic acid (Ka = 1.30 x 10-5) results in a pH of 2.64.
- The pH of a 0.061 M NaOH solution is around 12.79.
- Calculate the pH of a 0.100 M benzoic acid solution (Ka = 6.50 x 10-5); the result is 2.59.
Equilibrium and Reaction Constants
- For the reaction OH- + CH3OH ⇌ H2O + CH3O-, the equilibrium constant (Kc) is less than 1.
- For H3PO4(aq) + HSO4-(aq) ⇌ H2PO4-(aq) + H2SO4(aq), Kc is also less than 1.
- In the reaction NH4+ + HCO3- ⇌ H2CO3 + NH3, Kc is less than 1, indicating the reactants are favored.
- The equilibrium constant (Kc) for HOCl(aq) + ClO3-(aq) ⇌ OCl-(aq) + HClO3(aq) is less than 1.
Weak Acids and Bases
- Weak acids in the given choices include H2Se and H2SO3.
- The weakest conjugate base corresponds to H2Te and Iodic acid (Ka = 1.7 x 10-1) has the weakest conjugate base.
- An aqueous solution of diethylamine (C2H5)2NH results in a pH of approximately 5.54.
Summary of Acid Strength
- The selection of stronger acids from pairs: HI over HBr, H2SeO3 over H3AsO3, and HNO3 over HNO2.
- Classifications for acids: H2TeO4 is a weak acid, and H2S is also classified as a weak acid.
Other Key Points
- Conjugate bases include HS- for H2S, PO33- for HPO32-, and relevant calculations yield pH results for sodium formate (8.52) and related compounds.
- The pH of ethylammonium iodide (C2H5NH3I) is 5.13, indicating a mildly acidic solution.
- Kb values for various compounds play a crucial role in assessing the basicity and corresponding pH of their solutions.
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Description
Test your understanding of VSEPR theory by predicting the electron-pair arrangement and molecular geometry for ozone and other related molecules. This quiz will challenge your knowledge about molecular shapes and electron configurations.
