what are acids and alkalis?
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Acids have a pH less than 7. Alkalis have a pH greater than 7 Neutral substances have a pH equal to 7. ... Acids contain lots of hydrogen ions, which have the symbol H+. Alkalis contain lots of hydroxide ions, symbol OH-. Water is neutral because the number of hydrogen ions is equal to the number of hydroxide ions.
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A strong alkali dissociates completely to form OH- ions. A weak alkali only partially dissociates to form OH- ions. An example of a strong alkali is is sodium hydroxide.
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The pH scale goes from 1-14, with pH7 being completely neutral, i.e water. Anything with a very low pH is acidic, while substances with a high pH are alkaline. ... Acids have a few different definitions, but overall they are substances that can generate hydrogen ions when in a solution.
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Baking soda, also known as sodium bicarbonate, is a base. This means that when people dissolve baking soda in water, it forms an alkaline solution. For example, a 0.1 molar solution of baking soda has a pH of around 8.3.
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The alkali metals include: lithium, sodium, potassium, rubidium, cesium, and francium. Although often listed in Group 1 due to its electronic configuration, hydrogen is not technically an alkali metal since it rarely exhibits similar behavior.
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Salt is a compound, which is an acid and a base combined. There are many chemical compounds that are classified as salts according to Journey Into Science. The most common is table salt, or sodium chloride. Baking soda, or sodium bicarbonate, is also a salt.
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The alkali hydroxides are a class of chemical compounds which are composed of an alkali metal cation and the hydroxide anion (OH−). The alkali hydroxides are: Lithium hydroxide (LiOH) Sodium hydroxide (NaOH) ... Rubidium hydroxide (RbOH)
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Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline. Because acidity and alkalinity relate to pH, they may also be known as pH indicators. Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice.
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What two ions are associated with an acid? The two ions associated with an acid are H+ and H30+. What ion is associated with a base? A ion associated with a base is salt water.
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['Aqueous solutions of acids are electrolytes, meaning that they conduct electrical current. ... ', 'Acids have a sour taste. ... ', 'Acids change the color of certain acid-base indicates. ... ', 'Acids react with active metals to yield hydrogen gas. ... ', 'Acids react with bases to produce a salt compound and water.']
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Decomposition and pH are two common chemical properties of sodium bicarbonate. The concentration of hydrogen ions (H+) in a solution is a chemical property referred to as pH. The pH scale ranges from 0 to 14.
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Acids salts contain acidic or replaceable hydrogen in their composition. They react with further amounts of bases to give normal salts (NaHSO4 + NaOH = Na2SO4 + H2O). An 'acid salt' need not be acidic in nature. ... Thus, NaHSO4 and NaH2PO4 are acidic whereas NaHCO3 and Na2HPO4 are distinctly basic in aqueous medium.
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Essentially a base is a chemical which will react with an acid to form a salt and water only. An alkali is a water-soluble base. These are all Group I metal hydroxides, plus calcium hydroxide (which is just soluble in water) plus ammonium hydroxide.
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With a pKa of around 16–19, they are, in general, slightly weaker acids than water. With strong bases such as sodium hydride or sodium they form salts called alkoxides, with the general formula RO− M+. The acidity of alcohols is strongly affected by solvation. In the gas phase, alcohols are more acidic than in water.
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The alkali metals are six chemical elements in Group 1, the leftmost column in the periodic table. They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
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People confuse pH vs. alkalinity and we can understand why. Just remember that pH is an equilibrium that functions like a scale measuring how acidic or how basic a substance is. Total alkalinity measures the amount or concentration (in parts per million) of dissolved bicarbonate, carbonate and hydroxide ions.
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Acids contain lots of hydrogen ions, which have the symbol H+. Alkalis contain lots of hydroxide ions, symbol OH-. Water is neutral because the number of hydrogen ions is equal to the number of hydroxide ions.