Acids and Bases

Use the word bank below to fill in the blanks in the text. An acid is a substance that releases hydrogen ions (H+) into a solution.A base is a substance that releases hydroxide ions (OH-) into a solution.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 Observe some pH scales through google images or similar.Add examples of substances that you find to the scale below by clicking on a dot and then entering the text. pH Indicators Complete the following sentences by matching up the correct pair. In acids, litmus paper turns red. In bases, litmus paper turns blue. Universal indicator has a different color for each pH. 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 metals Bases pH > 7 Bitter Increases the [OH-] in water Accepts OH- ions Turns red litmus indicator blue Does not react with metals Both Acids and Bases Compounds Can be corrosive substances Releases ions in solutions Conducts Electricity Explain why monitoring the pH of swimming pools and fish tanks is important.