VSEPR Theory Quiz: Test Your Chemistry Knowledge

Questions and Answers

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?

HClO2 (correct)

HCl

HBr

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.

strong base Signup and view all the answers

Give the conjugate base of H3PO4.

H2PO4- Signup and view all the answers

Which of the following acids has the strongest conjugate base?

NH3 Signup and view all the answers

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.

Kc < 1 Signup and view all the answers

Consider the reaction H3PO4(aq) + HSO4- ⇌ H2PO4-(aq) + H2SO4(aq). Determine the size of Kc.

Kc < 1 Signup and view all the answers

Calculate the pH of a 0.20 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).

8.94 Signup and view all the answers

Calculate the pH of a 0.400 M solution of propanoic acid, for which the Ka value is 1.30 x 10-5.

2.64 Signup and view all the answers

Is an aqueous solution of NH4Cl acidic, basic or neutral?

Acidic Signup and view all the answers

What is the pH of 0.354 M trimethylammonium iodide, (CH3)3NHI?

5.13 ± 0.02 Signup and view all the answers

Calculate the pH of a 0.50 M solution of sodium acetate (NaCH3COO).

9.26 Signup and view all the answers

Use VSEPR theory to predict the molecular geometry of the bromate ion, BrO3-.

Trigonal-pyramidal Signup and view all the answers

Which of the following is not a strong acid in aqueous solution?

H2SO3 Signup and view all the answers

What is the pH of a 0.284 M solution of HBr?

0.55 ± 0.02 Signup and view all the answers

Classify H2Se as a type of acid or base.

Weak acid Signup and view all the answers

Match each substance with the correct designation for the reaction equation H2O + HS- ⇌ OH- + H2S.

H2S = B HS- = A OH- = C H2O = D Signup and view all the answers

Which of the following acids has the weakest conjugate base?

Iodic acid, Ka = 1.7 x 10-1 Signup and view all the answers

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.

Kc < 1 Signup and view all the answers

Consider the reaction H3SbO4(aq) + HTeO4- ⇌ H2SbO4-(aq) + H2TeO4(aq). Determine the size of Kc.

Kc < 1 Signup and view all the answers

Calculate the pH of a 0.50 M solution of ammonia (NH3, Kb = 1.8 x 10-5).

11.48 Signup and view all the answers

Calculate the pH of a 0.100 M solution of lactic acid, for which the Ka value is 1.40 x 10-4.

2.43 Signup and view all the answers

Is an aqueous solution of NaCN acidic, basic or neutral?

Basic Signup and view all the answers

What is the pH of 0.58 M ethylammonium iodide, C2H5NH3I?

5.43 ± 0.02 Signup and view all the answers

Calculate the pH of a 0.10 M solution of sodium benzoate (NaC6H5COO).

8.59 Signup and view all the answers

Use VSEPR theory to predict the electron-pair arrangement and molecular geometry of tetrahydroborate ion, BH4-.

Tetrahedral Signup and view all the answers

Which of the following is not a strong acid in aqueous solution?

H2SO3 Signup and view all the answers

What is the pH of a 0.061 M solution of NaOH?

12.79 ± 0.02 Signup and view all the answers

Classify H2TeO4 as a type of acid or base.

Weak acid Signup and view all the answers

Give the conjugate base of HPO32-.

PO33- Signup and view all the answers

Which of the following acids has the weakest conjugate base?

Chloroacetic acid, Ka = 1.4 x 10-3 Signup and view all the answers

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.

Kc < 1 Signup and view all the answers

Consider the reaction HOCl(aq) + ClO3-(aq) ⇌ OCl-(aq) + HClO3(aq). Determine the size of Kc.

Kc < 1 Signup and view all the answers

Calculate the pH of a 0.40 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).

9.09 Signup and view all the answers

Calculate the pH of a 0.100 M solution of benzoic acid, for which the Ka value is 6.50 x 10-5.

2.59 Signup and view all the answers

Is an aqueous solution of CuCl2 acidic, basic or neutral?

Acidic Signup and view all the answers

What is the pH of 0.51 M diethylammonium chloride, (C2H5)2NH2Cl?

5.57 ± 0.02 Signup and view all the answers

Calculate the pH of a 0.20 M solution of sodium formate (NaHCOO).

8.52 Signup and view all the answers

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.

Chemistry VSEPR Theory Quiz

Questions and Answers

The electron-pair arrangement of ozone, O3, is ___ and the molecular geometry is ___.

Which of the following is not a strong acid in aqueous solution?

What is the pH of a 0.07 M solution of KOH?

Classify CsOH as a type of acid or base.

Give the conjugate base of H3PO4.

Which of the following acids has the strongest conjugate base?

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.

Consider the reaction H3PO4(aq) + HSO4- ⇌ H2PO4-(aq) + H2SO4(aq). Determine the size of Kc.

Calculate the pH of a 0.20 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).

Calculate the pH of a 0.400 M solution of propanoic acid, for which the Ka value is 1.30 x 10-5.

Is an aqueous solution of NH4Cl acidic, basic or neutral?

What is the pH of 0.354 M trimethylammonium iodide, (CH3)3NHI?

Calculate the pH of a 0.50 M solution of sodium acetate (NaCH3COO).

Use VSEPR theory to predict the molecular geometry of the bromate ion, BrO3-.

Which of the following is not a strong acid in aqueous solution?

What is the pH of a 0.284 M solution of HBr?

Classify H2Se as a type of acid or base.

Match each substance with the correct designation for the reaction equation H2O + HS- ⇌ OH- + H2S.

Which of the following acids has the weakest conjugate base?

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.

Consider the reaction H3SbO4(aq) + HTeO4- ⇌ H2SbO4-(aq) + H2TeO4(aq). Determine the size of Kc.

Calculate the pH of a 0.50 M solution of ammonia (NH3, Kb = 1.8 x 10-5).

Calculate the pH of a 0.100 M solution of lactic acid, for which the Ka value is 1.40 x 10-4.

Is an aqueous solution of NaCN acidic, basic or neutral?

What is the pH of 0.58 M ethylammonium iodide, C2H5NH3I?

Calculate the pH of a 0.10 M solution of sodium benzoate (NaC6H5COO).

Use VSEPR theory to predict the electron-pair arrangement and molecular geometry of tetrahydroborate ion, BH4-.

Which of the following is not a strong acid in aqueous solution?

What is the pH of a 0.061 M solution of NaOH?

Classify H2TeO4 as a type of acid or base.

Give the conjugate base of HPO32-.

Which of the following acids has the weakest conjugate base?

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.

Consider the reaction HOCl(aq) + ClO3-(aq) ⇌ OCl-(aq) + HClO3(aq). Determine the size of Kc.

Calculate the pH of a 0.40 M solution of aniline (C6H5NH2, Kb = 3.8 x 10-10).

Calculate the pH of a 0.100 M solution of benzoic acid, for which the Ka value is 6.50 x 10-5.

Is an aqueous solution of CuCl2 acidic, basic or neutral?

What is the pH of 0.51 M diethylammonium chloride, (C2H5)2NH2Cl?

Calculate the pH of a 0.20 M solution of sodium formate (NaHCOO).

Study Notes

VSEPR Theory & Molecular Geometry

Acids and Bases

pH Calculations

Equilibrium and Reaction Constants

Weak Acids and Bases

Summary of Acid Strength

Other Key Points

Studying That Suits You

Description

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