Where can i get notes about acids and bases for a chemistry of foods test???
In theory, any substance that undergoes a reversible chemical change when pH changes can be used as an acid-base indicator. In practice, a sharp change in some easily detectable property of the substance is required. Usually, the property is color; but other properties such as odor can also change with pH. Here’s a partial list of house and garden materials that can be used as acid/base indicators. Notice that most of the materials are derived from plants. Almost any flower, fruit, or plant part that is red, blue, or purple contains a class of chemical compounds called anthocyanins that change color with pH. The color of a flower or fruit depends on which anthocyanins are present, the pH of the pigment-bearing tissues, and the presence of other pigments, like yellow flavones. To learn more about why indicator molecules change color with pH, see Water to Wine. # Baking soda, NaHCO3, fizzes when added to an acidic solution, but no change occurs in basic solution. The reaction is HCO3-(aq
