Writing Ionic Formulas

Materials

Procedures

  1. Separate the cations from the anions and group the same ions together.
  2. Locate ion cards for the first two combining ions listed in the first column of the data table, e.g. Al3+ ion and Cl-.
  3. Put the cards for the two combining ions together on a flat surface adding additional cards of the same ion until the heights of the cation and anion columns are equal. (See figure 1.)
  4. Al3+ Cl-
    Cl-
    Cl-
    Figure 1
  5. Record the charge and the number of each ion used.
  6. Write the formula for the ionic compound. (Notice that the numbers recorded for each ion are the subscripts in the chemical formula of the compound.)
  7. Write the name for each ion.
  8. Name the compound.
  9. Repeat steps 2 ~ 7 for all the ions listed in the data table.

Data

combining ions charge of cation charge of anion number of cations number of anions formula of compound name of cation name of anion name of compound
Al3+ & Cl- ??? ??? ??? ??? ??? ??? ??? ???
Na+ & O2- ??? ??? ??? ??? ??? ??? ??? ???
Fe2+ & S2- ??? ??? ??? ??? ??? ??? ??? ???
Fe3+ & O2- ??? ??? ??? ??? ??? ??? ??? ???
Ag+ & NO3- ??? ??? ??? ??? ??? ??? ??? ???
Cu2+ & OH- ??? ??? ??? ??? ??? ??? ??? ???
NH4+ & CO32- ??? ??? ??? ??? ??? ??? ??? ???
Na+ & H- ??? ??? ??? ??? ??? ??? ??? ???
H+ & S2- ??? ??? ??? ??? ??? ??? ??? ???
H+ & SO42- ??? ??? ??? ??? ??? ??? ??? ???
Charts of Ions and Names

Analysis

1. How do you name an ionic compound? ???
2. What does a numerical subscript following an ion in a chemical formula mean? ???
3. When is it appropriate to use Roman numerals in naming compounds? ???
4. Why do you use parentheses? ???
5. What is the difference between -ide, -ite, and -ate? ???


Formula Names answer




How to do this assignment?

Chemistry in October