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Portfolio Chem

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Submitted By brimmerp1747
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Acids and Bases

Acids are substances that produce protons, H+. Bases are substances that produce hydroxide ions, OH-. Acids taste sour, react with certain metals to produce hydrogen gas, and cause certain organic dyes to change color. Acids also react with limestone, CaCO3, to produce carbon dioxide and react with bases to from salts and water. Bases taste bitter, feel slippery or soapy, and react with oil and grease. Also, bases cause certain organic dyes to change color and reacts with acids to form salts and water. Arrhenius Acids are substances that contain hydrogen and ionize to produce hydrogen ions in an aqueous solution. Arrhenius bases are substances that contain a hydroxide group and dissociate to produce a hydroxide ion in an aqueous solution.

Examples:

Acid: hydrogen gas dissolves in water
HCl (g) H+(aq) + Cl- (ag)

Base: sodium hydroxide dissolves in water
NaOH (s) Na+ (aq) + OH- (aq)

Finding pH & pOH In chemistry, pH is the negative logarithm of the activity of the hydrogen ion in an aqueous solution. The pH range goes from zero up until fourteen. Solutions with a pH less than seven are considered to be acidic and solutions with a pH greater then seven are basic. Solutions with a pH of exactly seven are said to be neutral. To calculate pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter. Then the pH is calculated using the expression: -log {H+}. pOH is the measure of the concentration of hydroxide ions. To calculate the pOH of a solution you need to know the concentration of the hydroxide ion in moles per liter. Then the pOH is calculated using this expression: pOH= -log{OH-}. The pH and pOH of a water solution at 25 degrees Celsius are related by the following equation: pH + pOH = 14.00.

pH= -log {H+} pOH= -log{OH-} pH + pOH = 14.00

Examples:

{OH-} = 1.0 x 10-6

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