Materials cam be classified into three acids bases and salts.
acids taste sour
bases taste bitter

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An acid (from the Latin acidus/ac─ôre meaning sour) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form salts. Aqueous solutions of acids have a pH of less than 7. In chemistry, bases are substances that, in aqueous solution, are slippery to the touch, taste bitter, change the color of indicators (e.g., turn red litmus paper blue), react with acids to form salts, and promote certain chemical reactions. In chemistry, a salt is an ionic compound that results from the neutralization reaction of an acid and a base.
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