Acids and Bases Intro

Fill in the blanks in the text below.Click on a blank to show a list of words to choose from. An acid is a substance that releases hydrogen ions (H+) into a solution containing water.A base is a substance that releases hydroxide ions (OH-) into a solution containing water.Acids have a reputation for being extremely dangerous,but some are safe enough to eat and use in cooking. Bases also vary, from the caustic soda used to strip paint to gentler bases found in soap.Indicators show whether a solution is acidic or basic (alkaline), with some measuring how acidic or alkaline a solution is.The concentration of hydrogen ions in a solution is measured using the pH scale. In an acidic solution, there are more hydrogen ions than hydroxide ions. In contrast, an basic solution has more hydroxide ions than hydrogen ions. If it has equal numbers of hydrogen and hydroxide ions, then the solution is said to be neutral.It will have a pH of 7. Acids have a pH less than 7, while bases and alkali solutions have a pH greater than 7. pH Indicators Indicators are used to show color changes based on the pH of a solution. Complete the following sentences by matching up the correct pair.Use the graphic above for help. In acids, litmus paper turns red. In bases, litmus paper turns blue. Phenolphthalein turns an acid colorless and a base pink. Universal indicator has a different color for each pH. Bromothymol blue turns acids yellow-green and bases blue. Methyl orange turns red in an acid and yellow in a base. Acids vs. Bases Drag the descriptions to the correct heading.You may search Google if needed for help. Acids pH < 7 Donates H+ ions Turns blue litmus indicator red Increases the [H+] in solution Sour Reacts with some metals to give off hydrogen gas Often burns nose when smelled Feels sticky Bases pH > 7 Bitter Slippery Increases the [OH-] in water Turns red litmus indicator blue Usually (but not always) has no smell Contain metal oxides or hydroxides Both Acids and Bases Compounds Release ions in a solution