Acids and Bases

Master acids and bases! Learn about pH, indicators, and properties with our fun worksheet.

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. If a base can be dissolved in water, it is also known as an alkali. The solution it forms is an alkaline solution.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 alkaline 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. Create-a-Scale Use this link Type each of the following common substances below into the pH table where they belong.pure water, lemon juice, sea water, rainwater, bleach, vinegar, ammonia, stomach acid, oven cleaner, hydrochloric acid, sodium hydroxide, baking soda, coffee, tomatoes sodium hydroxide lemon juice vinegar rainwater pure water baking soda bleach stomach acid coffee seawater tomatoes hydrochloric acid ammonia oven cleaner pH Indicators 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. phenol Red turns very pink in base and yellow in slightly acidic water, used in pools 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 React with carbonates to produce asalt, water, and carbon dioxide gas Bases pH > 7 Bitter Increases the [OH-] in water Turns red litmus indicator blue Contain metal oxides or hydroxides Can react with fats and oils, so often used in soaps and cleaners Both Acids and Bases Electrolyte Release ions is solution Compounds Can be corrosive substances The Chemical Compositions of Insect Venoms Read the article and then use the information to answer the question in the next section. Complete the lesson below and then take the test that follows.Take the test as many times as needed to earn a passing score and then send me a screen-shot of your score as long as your name shows somewhere on the screen.