These worksheets work on understanding the properties of acids and bases in a chemistry based environment.

Liquids are classified as acids, bases, or neutral based on the concentration of hydrogen ions present in it. If a substance is neutral it has an equal amount of positive and negative ions present in it. If a liquid has a greater concentration of positive ions in the form of hydrogen than say water, it is classified as an acid. If the liquid has less hydrogen ions than water, it is a base. An acid and a base can be used to neutralize one another. When this occurs salt and water are formed. By the time we are ready for school, we have all heard the about acids and how bad they are. Many acids are very helpful to use in everyday life. When looking at acids and bases we are completely worried about the change or transfer of hydrogen or hydroxide ions. If a particular substance has many hydrogen ions, it is an acid. If it has a bunch of hydroxide ions, it’s a base. We use a pH scale to classify substance that ranges from 0 to 14, with 7 being neutral (meaning neither an acid nor a base. The closer a substance is to 0, the more of an acid it is. The closer to 14 a substance is, the more it is a base.

You will learn how to identify acids and bases based on their chemical symbol and you will learn to predict where they might fall on the pH scale. You will also begin to realize the relative strength of these substances based on the nature of the elements that are involved. You will also learn how the nature of a liquid can help you understand if they are good conductors of electricity. The worksheets work on identifying acids and bases based on a number of different criteria and your understanding of ion transfer.

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Are They Acids, Bases, or Salts?

Classify each of the following substances as an acid, a base or a salt. You will need to look at the elements that are in each compound and determine how likely it is to give off a hydrogen ion.

Understanding the pH Scale

Identify whether the solutions listed below are acids or bases. Write the color expected for each indicator (phenolphthalein, litmus dye) when immersed and indicate the pH range you would expect. While indicators such as phenolphthalein and litmus are not an exact tool, they can give a general idea of the nature of a substance.

Classify the Compounds

Determine the nature of each compound and determine if it would be weak or strong. Some of these will be classified as salts.

Understanding the pH Scale

We work to identify liquids that would meet all these different pH values. Then we predict how they would react around common indicators. Work on figuring out how each pH level would react with Blue Litmus, Phenolphthalein, and Red Litmus.

pH of Salt Solutions

Salts are given off as a byproduct as a result of a reaction between these two classes of liquids. The strong bases are the Group I and Group II hydroxides and most others are considered weak. Provide the missing chemical formulas and terms in the chart below.

Conductors and Electrolytes

Which substance would allow current to travel in the presence of water?