Properties of Acids Acids change the color of

Properties of Acids: Acids change the color of litmus from blue to red. They convert the color of methyl orange from orange/yellow to pink. Acids turn the pink color of Phenolphthalein to colorless. Acids can conduct electricity.

Properties of Bases: Bases change the color of litmus from red to blue. They are bitter in taste. Bases lose their basicity when mixed with acids. Strong alkalis are highly corrosive in nature whereas other alkalis are mildly corrosive.

Properties of Salts: Some acids are strong electrolytes because they ionize completely in water , yielding a great many ions. Acids change the color of certain acid-base indicators. Acids have a sour taste. Lemons vinegar and sour candies all contains acids. Acids react with active metals to yield hydrogen gas.

PH and its Range: The PH of an aqueous solution is the measure of how acidic or basic it is. The PH of an aqueous solution is based on the Ph scale which typically ranges from 0 to 14 in water. A Ph of 7 is considered to be neutral. A Ph of less than 7 is considered acidic. A Ph of greater than 7 is then considered basic.

Natural Indicators: Many fruits and vegetables contain pigments that change color in response to PH, indicators. Most of these pigments are anthocyanins, which commonly range in color from red to purple to blue in plants, depending on their PH. Plants containing anthocyanins include acai, currant, chokeberry, eggplant, orange, blackberry, raspberry, blueberry, cherry , grapes and colored corn. Any of these plants may be used as PH indicators.

Significance of Laboratory: Skills- manipulative, inquiry, investigative, organizational, communicative. Concepts- for example, hypothesis, theoretical model, taxonomic category. Cognitive abilities- critical thinking , problem solving, application, analysis, synthesis. Understanding the nature of science- scientific enterprise, scientists and how they work, existence of a multiplicity of scientific methods, interrelationships between science and technology and among the various disciplines of science. Attitudes- for example, curiosity, internet, risk taking, objectivity, precision, confidence, perseverance, satisfaction, responsibility, consensus, collaboration, and liking science.