Chapter 2: Problem 88
Write the formula of (a) sodium nitrate. (b) beryllium hydroxide. (c) ammonium acetate. (d) potassium sulfite.
Short Answer
Expert verified
(a) NaNO_3, (b) Be(OH)_2, (c) NH_4CH_3COO, (d) K_2SO_3.
Step by step solution
01
Understand the Chemical Name
Before writing formulas, identify each compound's components from their common names. For example, sodium nitrate is composed of sodium ions and nitrate ions.
02
Determine Ions Involved
Identify the ions in each compound.
(a) Sodium Nitrate: Na^+ (sodium ion) and NO_3^- (nitrate ion).
(b) Beryllium Hydroxide: Be^{2+} (beryllium ion) and OH^- (hydroxide ion).
(c) Ammonium Acetate: NH_4^+ (ammonium ion) and CH_3COO^- (acetate ion).
(d) Potassium Sulfite: K^+ (potassium ion) and SO_3^{2-} (sulfite ion).
03
Balance the Charges
Make sure the total positive charge and total negative charge in the compound are equal, so the compound is electrically neutral.
(a) Sodium Nitrate: 1 Na^+ balances with 1 NO_3^-, so the formula is NaNO_3.
(b) Beryllium Hydroxide: 1 Be^{2+} balances with 2 OH^-, so the formula is Be(OH)_2.
(c) Ammonium Acetate: 1 NH_4^+ balances with 1 CH_3COO^-, so the formula is NH_4CH_3COO.
(d) Potassium Sulfite: 2 K^+ balances with 1 SO_3^{2-}, so the formula is K_2SO_3.
04
Write the Final Formulas
Combine the balanced ions to write the final formula for each compound.
(a) Sodium Nitrate: NaNO_3.
(b) Beryllium Hydroxide: Be(OH)_2.
(c) Ammonium Acetate: NH_4CH_3COO.
(d) Potassium Sulfite: K_2SO_3.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Ionic Compounds
Ionic compounds are created when positive ions (cations) and negative ions (anions) come together to form a neutral compound. They are typically formed between metals and non-metals. For instance, sodium nitrate is an ionic compound formed by combining the sodium ion (a metal) and the nitrate ion (a non-metal polyatomic ion).
These compounds are characterized by the transfer of electrons from the metal to the non-metal, resulting in a stable arrangement of charges. The strength of ionic bonds is influenced by the charge and size of the ions involved.
These compounds are characterized by the transfer of electrons from the metal to the non-metal, resulting in a stable arrangement of charges. The strength of ionic bonds is influenced by the charge and size of the ions involved.
- Sodium Nitrate: Composed of Na鈦 and NO鈧冣伝 ions.
- Beryllium Hydroxide: Contains Be虏鈦 and OH鈦 ions.
- Ammonium Acetate: Includes NH鈧勨伜 and CH鈧僀OO鈦 ions.
- Potassium Sulfite: Made of K鈦 and SO鈧兟测伝 ions.
Balancing Charges
The process of balancing charges is crucial in forming ionic compounds. Since ionic compounds are electrically neutral, the total positive charge must balance with the total negative charge. This means the number of positive charges equals the number of negative charges in the compound.
To balance the charges, you need to adjust the number of cations and anions so that their charges cancel each other out. This often involves using subscripts in the chemical formula to indicate how many of each ion are needed.
For example:
To balance the charges, you need to adjust the number of cations and anions so that their charges cancel each other out. This often involves using subscripts in the chemical formula to indicate how many of each ion are needed.
For example:
- Sodium Nitrate (NaNO鈧): 1 Na鈦 ion balances with 1 NO鈧冣伝 ion.
- Beryllium Hydroxide (Be(OH)鈧): 1 Be虏鈦 ion balances with 2 OH鈦 ions.
- Ammonium Acetate (NH鈧凜H鈧僀OO): 1 NH鈧勨伜 ion balances with 1 CH鈧僀OO鈦 ion.
- Potassium Sulfite (K鈧係O鈧): 2 K鈦 ions balance with 1 SO鈧兟测伝 ion.
Chemical Naming
Understanding chemical naming is vital for deciphering the formulas of ionic compounds. Commonly, the name of an ionic compound tells you the type and number of ions forming it. The name generally starts with the cation followed by the anion.
- Sodium Nitrate is made from sodium (Na鈦) and nitrate (NO鈧冣伝).
- Beryllium Hydroxide has beryllium (Be虏鈦) combined with hydroxide (OH鈦).
- Ammonium Acetate consists of ammonium (NH鈧勨伜) and acetate (CH鈧僀OO鈦).
- Potassium Sulfite is a result of combining potassium (K鈦) with sulfite (SO鈧兟测伝).
Understanding these naming conventions helps in writing and deciphering chemical formulas accurately.
Guidelines for Ionic Compound Naming:
- Cations: Use the element's name, such as 'sodium' for Na鈦 and 'potassium' for K鈦.
- Anions: For single-element ions, the ending is changed to '-ide', while polyatomic ions have specific names, like 'nitrate' for NO鈧冣伝 and 'sulfite' for SO鈧兟测伝.
- Sodium Nitrate is made from sodium (Na鈦) and nitrate (NO鈧冣伝).
- Beryllium Hydroxide has beryllium (Be虏鈦) combined with hydroxide (OH鈦).
- Ammonium Acetate consists of ammonium (NH鈧勨伜) and acetate (CH鈧僀OO鈦).
- Potassium Sulfite is a result of combining potassium (K鈦) with sulfite (SO鈧兟测伝).
Understanding these naming conventions helps in writing and deciphering chemical formulas accurately.
Anions and Cations
Anions and cations are types of ions鈥攃harged particles formed when atoms gain or lose electrons. These oppositely charged ions are the building blocks of ionic compounds.
Understanding these ions is crucial in predicting how they combine to form neutral compounds. By recognizing which ions serve as cations and anions, you can determine how they fit into the larger framework of a compound, assess the necessary charge balance, and write accurate chemical formulas.
Cations:
- Positively charged ions formed when an atom loses electrons. - Usually occur with metals. - Examples include Na鈦, K鈦, and Be虏鈦.Anions:
- Negatively charged ions formed when an atom gains electrons. - Commonly occur with non-metals and polyatomic entities. - Examples include NO鈧冣伝, OH鈦, and SO鈧兟测伝.Understanding these ions is crucial in predicting how they combine to form neutral compounds. By recognizing which ions serve as cations and anions, you can determine how they fit into the larger framework of a compound, assess the necessary charge balance, and write accurate chemical formulas.