Ch.3 - Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: What is the name of the following ion: H 2PO4-?


What is the name of the following ion: H 2PO4-?


For this problem, we are asked to name the ion H2PO-.

First, we need to determine whether it is an ionic compound, covalent compound or an acid (binary or oxyacid). Based on its chemical formula, H2PO4- is similar to an oxyacid  

**H+ ion bonded to PO4 which is a polyatomic anion containing O. 

An oxyacid is a covalent compound that contains an H+ ion connected to a polyatomic ion containing oxygen.

Recall that the rules for naming ions are similar to naming oxyacids in gas phase (not aqueous):

1. Start with Hydrogen, write a prefix to indicate the number of H, (except for mono) 

The numerical prefixes are:

Mono – 1     Di – 2

Tri – 3          Tetra – 4

Penta – 5     Hexa – 6

Hepta – 7     Octa – 8

Nona – 9      Deca – 10

2. For Polyatomic ions they retain their name 

**no prefixes needed 

**no need to change ending to -ide 

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