Chemistry Practice Problems Calculate Oxidation Number Practice Problems Solution: Arsenic forms binary compounds with Cl and with Mg...

Solution: Arsenic forms binary compounds with Cl and with Mg.Will it be in the same oxidation state in these two compounds?

Problem

Arsenic forms binary compounds with Cl and with Mg.

Will it be in the same oxidation state in these two compounds?

Solution

We’re asked to determine whether the oxidation state of Arsenic, As will be the same when it forms binary compounds with Cl and Mg


The rules for oxidation states are as follows:


A. General Rules:

1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.)    O.S. = 0

2. For an ion (Li+, Al3+, etc.)                                                       O.S. = charge


B. Specific Rules:

1. Group 1A              O.S. = +1

2. Group 2A              O.S. = +2

3. Hydrogen              O.S. = +1, with nonmetals

                                  O.S. = –1 with metals and boron

4. Fluorine                 O.S. = –1

5. Oxygen                  O.S. = –1 in peroxides (X2O2, X = Group 1A)

                                  O.S. = –1/2 in superoxides (XO2, X = Group 1A)

                                  O.S. = –2 in other compounds

6. Group 7A               O.S. = –1 (except when bonded to O)


First, we need to write the formula of the binary compounds of As with Cl and Mg


Recall that Arsenic, As is a semimetal or metalloid:

  • has properties of both metals and nonmetals

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