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- "Na"_2"S" When dealing with ionic compounds, it's important to know that the cation is always written first and the anion is written second. In this case, sodium,"Na", will be your cations and sulfide will be your anion.
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Figure 2.7.2 lists the ions (cation and anion) that have invariant oxidation states. All the anions are of this type, gaining the number of electrons required to fill the valence shell and become isoelectronic with the nearest noble gas (have the same electron configuration).
Sep 25, 2022 · Sodium sulfide, another ionic compound, has the formula \(\ce{Na_2S}\). This formula indicates that this compound is made up of twice as many sodium ions as sulfide ions. This section will teach you how to find the correct ratio of ions, so that you can write a correct formula.
- Introduction
- Definitions of molecular, complete ionic, and net ionic equations
- Summary
- Try it!
As a diligent student of chemistry, you will likely encounter tons of reactions that occur in aqueous solution (perhaps you are already drowning in them!). When ions are involved in a reaction, the equation for the reaction can be written with various levels of detail. Depending on which part of the reaction you are interested in, you might write a...
A molecular equation is sometimes simply called a balanced equation. In a molecular equation, any ionic compounds or acids are represented as neutral compounds using their chemical formulas. The state of each substance is indicated in parentheses after the formula.
[Huh?]
Let's consider the reaction that occurs between AgNO3 and NaCl . When aqueous solutions of AgNO3 and NaCl are mixed, solid AgCl and aqueous NaNO3 are formed. Using this information, we can write a balanced molecular equation for the reaction:
AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)
[What kind of reaction is this?]
If we could zoom in on the contents of the reaction beaker, though, we wouldn't find actual molecules of AgNO3 , NaCl , or NaNO3 . Since AgNO3 , NaCl , and NaNO3 are soluble ionic compounds, they dissociate into their constituent ions in water. For example, NaCl dissociates into one ion of Na+ for every ion of Cl− ; these ions are stabilized by ion-dipole interactions with the surrounding water molecules.
A net ionic equation shows only the chemical species that are involved in a reaction, while a complete ionic equation also includes the spectator ions. We can find the net ionic equation for a given reaction using the following steps:
1.Write the balanced molecular equation for the reaction, including the state of each substance.
2.Using your knowledge of solubility rules, strong acids, and strong bases, rewrite the molecular equation as a complete ionic equation that shows which compounds are dissociated into ions.
[I haven't learned about strong acids and bases yet!]
3.Identify and cancel out the spectator ions (the ions that appear on both sides of the equation).
[Want to double check your work?]
Sulfuric acid, H2SO4(aq) , is a strong acid that completely dissociates into H+ and SO42− ions in aqueous solution. Sodium hydroxide, NaOH(aq) , is a strong base that completely dissociates into Na+ and OH− ions in aqueous solution. When H2SO4(aq) and NaOH(aq) are combined, the products are water and aqueous sodium sulfate, Na2SO4(aq) . This reaction is represented by the molecular equation below.
HA2SOA4(aq)+2NaOH(aq)→2HA2O(l)+NaA2SOA4(aq)
Which of the following is the balanced net ionic equation for the reaction between H2SO4(aq) and NaOH(aq) ?
Choose 1 answer:
Choose 1 answer:
•(Choice A)
Mar 11, 2022 · Formula for Ionic Compounds. When writing the formula of an ionic compound we use the lowest whole number ratio of cations ([+] ions) to anions ([-] ions). If you look at a salt crystal you will see that each positive ion is surrounded on all 6 sides by negative ions, and that a crystal lattice forms.
Oct 18, 2022 · By convention, the anion portion of a chemical name or formula follows the cation. For example, in sodium chloride (NaCl), the cation is the sodium ion (Na +) and the anion is the chloride ion (Cl – ). Note the electrical charge of a cation or anion follows its chemical formula as a superscript.
The result is that the atom becomes a cation —an ion with a net positive charge. For example, the element sodium loses one electron to become a cation: Similarly, when a neutral atom gains one or more electrons, the result is that the atom becomes an anion —an ion with a net negative charge.
How do you write an ionic formula given an anion and a cation? Lets take the ionic formula for Calcium Chloride is CaCl2. Calcium is an Alkaline Earth Metal in the second column of the periodic table. This means that calcium has 2 valence electrons it readily gives away in order to seek the stability of the octet. This makes calcium a Ca+2 cation.
