These particular substances produce hydroxide ions (OH−) in aqueous solutions, and are thus classified as Arrhenius bases. For a substance to be classified as an Arrhenius base, it must produce hydroxide ions in an aqueous solution. In the Lewis model, a base is an electron pair donor.
What is an acid and a base?
By the 1884 definition of Svante Arrhenius (Sweden), an acid is a material that can release a proton or hydrogen ion (H +). Hydrogen chloride in water solution ionizes and becomes hydrogen ions and chloride ions. If that is the case, a base, or alkali, is a material that can donate a hydroxide ion (OH-).
Any of a class of compounds that form hydroxyl ions (OH) when dissolved in water, and whose aqueous solutions react with acids to form salts. Bases turn red litmus paper blue and have a pH greater than 7. Their aqueous solutions have a bitter taste. Compare acid.
Thus, sodium hypochlorite is neither an acid or a base. Chlorine bleach is strongly basic. We actually make it by dissolving chlorine gas in a concentrated solution of sodium hydroxide, which forms sodium hypochlorite and sodium chloride, in the following equilibrium.
Four bases of American dating:
- F1 - French Kissing: First base is equivalent to french kissing, not just kissing.
- F2 - Feeling: Second base is touching of private extremities and/or appendages of the partners' body, aka boob touch.
- F3 - Fellatio: Third base is oral sex.
Base, in chemistry, any substance that in water solution is slippery to the touch, tastes bitter, changes the colour of indicators (e.g., turns red litmus paper blue), reacts with acids to form salts, and promotes certain chemical reactions (base catalysis).
noun. physics any of the fundamental units in a system of measurement. The base SI units are the metre, kilogram, second, ampere, kelvin, candela, and mole.
1. In triangles. In the case of a triangle, a common way to calculate its area is 'half of base times height' where the 'height' is the altitude, or the perpendicular distance from the base to the opposite vertex. In an isosceles triangle, the base is usually taken to be the unequal side.
Transcript of Difference between Acids and Bases. : Acids and bases are two types of corrosive substances. Any substance with a pH value between 0 up to 7 is considered acidic, whereas a pH value of 7 to 14 is a base. Acids are ionic compounds that break apart in water to form a hydrogen ion (H+).
The strong acid hydrogen chloride (HCl) is one example. If one of the ions is OH-, the solution is basic. An example of a strong base is sodium hydroxide (NaOH). There are other ions that make acidic and basic solutions, but we won't be talking about them here.
The solution is neither acidic or basic. Because the base "soaks up" hydrogen ions, the result is a solution with more hydroxide ions than hydrogen ions. This kind of solution is alkaline. Acidity and alkalinity are measured with a logarithmic scale called pH.
pH is a measure of the hydorgen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH and solutions with a low concentrations of H+ ions have a high pH. This may seem like a confusion way to express these reationships, and it is, until you understand what pH stands for.
Water acts as an acid (donates H+) when it reacts with a stronger base, say sodium hydroxide. Water acts as a base (accepts H+) when it reacts with a stronger acid, say hydrochloric acid. If the medium is water, water, having a pH of 7, is considered neutral.
They react with metals like zinc to give off hydrogen. Bases in water solutions also show certain properties or characteristics. They taste bitter and and turn litmus paper blue. They also have a slimey or slippery texture to them.
pH is a measure of hydrogen ion concentration; a measure of the acidity or alkalinity of a solution. Aqueous solutions at 25°C with a pH less than seven are acidic, while those with a pH greater than seven are basic or alkaline.
The part of the word that cannot be broken down is called a base word, also known as a root word. Sometimes, base words have a prefix, which is a letter or letters added to the beginning, or a suffix, which is a letter or letters added to the end. Prefixes and suffixes change the base word's meaning.
A strong base is something like sodium hydroxide or potassium hydroxide which is fully ionic. You can think of the compound as being 100% split up into metal ions and hydroxide ions in solution. Each mole of sodium hydroxide dissolves to give a mole of hydroxide ions in solution.
Base Definition: A base is a chemical species that donates electrons or hydroxide ions or that accepts protons. Types of Bases: Arrhenius base, Bronsted-Lowry base, Lewis base. Return to the Chemistry Glossary Index. Helmenstine, Anne Marie, Ph.D. "Base Definition."
Answer 2: In fact, it is quite not accurate to say that hydrogen gains or loses an electron in acid/base. What is more accurate is to DEFINE an acid as a proton donor (the acid gives up a proton) and a base as a proton acceptor (the base takes up a proton).
A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen'). A pH value is a number from 1 to 14, with 7 as the middle (neutral) point. Values below 7 indicate acidity which increases as the number decreases, 1 being the most acidic.
Acids in food such as vinegar (acetic acid), soda water (carbonic acid) and lemon juice (citric acid) are weak acids. Some acids can lose more than one proton. For example, carbonic acid can lose two protons, while citric and phosphoric acids can lose three. Bases, called alkalis if an OH- is involved, accept protons.