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Home > Curriculum Support > High School / Senior High > Chemistry 3rd Edition > How do you know that the salt in On Your Own 13.1c is K2CO3?
How do you know that the salt in On Your Own 13.1c is K2CO3?
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You must remember what you learned in Modules 4 and 5. In Module 4 (pp. 136-145), you learned how to determine the chemical formula of simple ionic compounds. In Module 5 (pp. 177-181), you learned the same technique and applied it to ionic compounds which involve polyatomic ions. At the same time, you were required to memorize the polyatomic ions on p. 175.


Since you know K is a metal, any compound with K, C, and O is ionic. Thus, it follows these laws. As you learned in Module 4, in ionic compounds K has a charge of 1+. As you learned in Module 5, the only stable form of CO3 is the carbonate ion, CO3 2-. You don’t actually have to remember that, however, it just makes things easier. You are supposed to know that H2CO3 gives up two H 1+ ions. If you take 2 H’s and two positive charges away from H2CO3, you get CO3 2-. Thus, either way, you know you are dealing with

K1+ and CO3 2-


According to what was learned in Module 5, you can get the chemical formula by dropping the signs and switching the charges. Thus, it is


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