15.1: Classifications of Acids and Bases
| ACIDS | BASES |
|---|
| produce carbon dioxide when reacted with carbonates. | |
| Common examples: Lemons, oranges, vinegar, urine, sulfuric acid, hydrochloric acid | Common Examples: Soap, toothpaste, bleach, cleaning agents, limewater, ammonia water, sodium hydroxide. |
Answer and Explanation:
The formula NH4OH is ammonium hydroxide. It is a solution that is made up of ammonia and water. The pH of NH4OH is 11.6, so it is a base. This means15.1: Classifications of Acids and Bases
| ACIDS | BASES |
|---|
| produce carbon dioxide when reacted with carbonates. | |
| Common examples: Lemons, oranges, vinegar, urine, sulfuric acid, hydrochloric acid | Common Examples: Soap, toothpaste, bleach, cleaning agents, limewater, ammonia water, sodium hydroxide. |
The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic.
An acid is a substance that donates hydrogen ions. Now there are more hydrogen ions than hydroxide ions in the solution. This kind of solution is acidic. A base is a substance that accepts hydrogen ions. When a base is dissolved in water, the balance between hydrogen ions and hydroxide ions shifts the opposite way.
An acid is a chemical species that donates protons or hydrogen ions and/or accepts electrons. Most acids contain a hydrogen atom bonded that can release (dissociate) to yield a cation and an anion in water.
Acids are named based on their anion — the ion attached to the hydrogen. In simple binary acids, one ion is attached to hydrogen. Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them.
HCl (g) is neither an acid or base, but it is acidic. There is not yet H+ ions, so it is neither an acid or base. HCl (aq) is an acid, namely hydrochloric acid.
This means the water is donating the hydrogen ion, which classifies it as an acid using the Brønsted concept. As these two reactions show, water can act as an acid or a base; molecules (or ions) that can do this are called amphiprotic. When an amphiprotic molecule (or ion) reacts with an acid, it acts as a base.
All acids contain hydrogen. Acids dissociate in water to produce hydrogen ions. Basically, acids are just ionic compounds that contain hydrogen. A strong acid completely ionizes, breaking down into positive hydrogen ions and negatively charged ions.
In simple binary acids, one ion is attached to hydrogen. Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them. For an acid with a polyatomic ion, the suffix “-ate” from the ion is replaced with “-ic.”
Acetic acid is a weak acid because it is not a strong acid which has a specific definition in chemistry: Strong acids completely dissociate in aqeous solution, that is, all their H+ come off in water. H+ is also called a proton because hydrogen without an electron is essentially a proton.
Chlorous acid is an inorganic compound with the formula HClO2. It is a weak acid. Although the acid is difficult to obtain in pure substance, the conjugate base, chlorite, derived from this acid is stable. One example of a salt of this anion is the well-known sodium chlorite.
To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrogen ions).
Covalently-bonded compounds are also known as molecules. In the compound, the first element is named first and with its full elemental name. The second element is named as if it were an anion (root name of the element + -ide suffix).
The strong acids are hydrochloric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, and chloric acid. The only weak acid formed by the reaction between hydrogen and a halogen is hydrofluoric acid (HF).
Examples Of Bases. Examples of bases are sodium hydroxide, calcium carbonate and potassium oxide. A base is a substance that can neutralize the acid by reacting with hydrogen ions. Most bases are minerals that react with acids to form water and salts. Bases include the oxides, hydroxides and carbonates of metals.
Strong Arrhenius Bases
- Potassium hydroxide (KOH)
- Sodium hydroxide (NaOH)
- Barium hydroxide (Ba(OH)2)
- Caesium hydroxide (CsOH)
- Strontium hydroxide (Sr(OH)2)
- Calcium hydroxide (Ca(OH)2)
- Lithium hydroxide (LiOH)
- Rubidium hydroxide (RbOH)
Common household chemical bases include ammonia, baking soda and lye.
- Baking Soda. Baking soda, or sodium bicarbonate (NaHCO3) has a pH of 8.3, higher than distilled water's pH of 7.0.
- Borax: Cleaning and Pest Control.
- Milk of Magnesia (Magnesium Hydroxide)
- Ammonia, Enemy of Dirt.
- Lye: Clog Buster.
Strong bases are able to completely dissociate in water
- LiOH - lithium hydroxide.
- NaOH - sodium hydroxide.
- KOH - potassium hydroxide.
- RbOH - rubidium hydroxide.
- CsOH - cesium hydroxide.
- *Ca(OH)2 - calcium hydroxide.
- *Sr(OH)2 - strontium hydroxide.
- *Ba(OH)2 - barium hydroxide.
Properties of Table Salt: Table salt is the product formed by the neutralization of an acid by a base. So it is neither Acid nor Base. If the pH is greater than 7, then it is basic.
Some common strong Arrhenius bases include:
- Potassium hydroxide (KOH)
- Sodium hydroxide (NaOH)
- Barium hydroxide (Ba(OH)2)
- Caesium hydroxide (CsOH)
- Strontium hydroxide (Sr(OH)2)
- Calcium hydroxide (Ca(OH)2)
- Lithium hydroxide (LiOH)
- Rubidium hydroxide (RbOH)
Some common strong Arrhenius bases include:
- Potassium hydroxide (KOH)
- Sodium hydroxide (NaOH)
- Barium hydroxide (Ba(OH)2)
- Caesium hydroxide (CsOH)
- Strontium hydroxide (Sr(OH)2)
- Calcium hydroxide (Ca(OH)2)
- Lithium hydroxide (LiOH)
- Rubidium hydroxide (RbOH)
In chemistry, acids and bases have been defined differently by three sets of theories. One is the Arrhenius definition, which revolves around the idea that acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (H+) ions while bases produce hydroxide (OH-) ions in solution.
βdc is the amplification factor by which the base current gets amplified by. So the total output current, IC will be IC=βdc x IB.
