Assign oxidation number of each atom in the following equation
HI .PBr. CaCO3.H3PO4.As2O3.H2SO4
Not A right question
Here is the main menu for CHEMTEAM which is a very good source for chemistry questions. Click on the reduction/oxidation link and that will give you VERY good instructions about assigning oxidation state values
://www.chemteam.info/ChemTeamIndex.html
To assign oxidation numbers to each atom in a compound or equation, you need to follow a set of rules:
1. The oxidation number of an atom in an elemental form is always zero. For example, hydrogen (H2) and phosphorus (P4) both have an oxidation number of zero.
2. Group 1 elements, such as hydrogen (H), have an oxidation number of +1 in most compounds. Similarly, group 2 elements, such as calcium (Ca), have an oxidation number of +2.
3. Oxygen (O) usually has an oxidation number of -2, unless it is in a peroxide where it has an oxidation number of -1. In compounds, the sum of the oxidation numbers of all the oxygen atoms is equal to the charge of the compound.
4. The sum of oxidation numbers in a neutral molecule is zero. For example, in HI, the oxidation number of hydrogen is +1 while the oxidation number of iodine (I) is -1.
5. When assigning oxidation numbers to polyatomic ions, you need to consider the overall charge of the ion. The sum of oxidation numbers in a polyatomic ion is equal to its charge.
Let's break down the given equation and assign oxidation numbers to each atom:
HI: Hydrogen typically has an oxidation number of +1 and iodine has an oxidation number of -1. Therefore, the oxidation numbers for hydrogen and iodine are +1 and -1, respectively.
PBr: The bromine (Br) atom has an oxidation number of -1 as it is combined with hydrogen (H) in the positive oxidation state. The oxidation number for phosphorus (P) is +1.
CaCO3: Calcium (Ca) is in Group 2, so its oxidation number is +2. Oxygen (O) has an oxidation number of -2. Carbon (C) has an oxidation number of +4 since +2 from two oxygen atoms balances out the -2 charge. Therefore, the oxidation numbers for calcium, carbon, and oxygen are +2, +4, and -2, respectively.
H3PO4: The oxidation number for hydrogen and oxygen remains the same, +1 and -2, respectively. Phosphorus (P) has an oxidation number of +5.
As2O3: Arsenic (As) has an oxidation number of +3, and oxygen remains -2.
H2SO4: Hydrogen is still +1, and oxygen is -2. Sulfur (S) has an oxidation number of +6.
I hope this explanation helps you understand how to assign oxidation numbers to each atom in a given equation or compound!