Acid
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An acid is a molecule or ion capable of either donating a proton, known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid.
Zinc, a typical metal, reacting with hydrochloric acid, a typical acid
Svante Arrhenius
Hydrochloric acid (in beaker) reacting with ammonia fumes to produce ammonium chloride (white smoke)
This is an ideal titration curve for alanine, a diprotic amino acid. Point 2 is the first equivalent point where the amount of NaOH added equals the amount of alanine in the original solution.
PH
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In chemistry, pH is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions are measured to have lower pH values than basic or alkaline solutions. While the
Test tubes containing solutions of pH 1 to 10 colored with an indicator
Lemon juice tastes sour because it contains 5% to 6% citric acid and has a pH of 2.2 (high acidity).