Phosphorus Acid and Ions

The video tutorial explains how to write the formula for phosphorus acid (H3PO3) by analyzing its name and applying chemical naming rules. It highlights the absence of 'hydro' and 'ick' in the name, indicating the use of 'ous' and 'ite' rules. The tutorial details the formation of the phosphite ion (PO3 3-) and emphasizes the exception in phosphorus naming. It concludes by balancing the charges to derive the final formula, H3PO3.

What is missing in the name 'phosphorus acid' that indicates it is not a binary acid?

• The suffix 'ate'

• The prefix 'hydro'

• The suffix 'ous'

• The prefix 'per'

What suffix is used in the name of phosphorus acid that helps in identifying its type?

• ic

• ous

• ite

• ate

When writing the formula for phosphorus acid, what is the exception for the phosphorus stem?

• Include 'or' in the stem

• Change 'ous' to 'ate'

• Exclude 'or' from the stem

• Add 'hydro' prefix

What is the formula for the phosphite ion?

• PO4 3-

• PO3 2-

• PO3 3-

• PO2 2-

Which ion table is used to identify the phosphite ion?

• Periodic table

• Common ion table

• Solubility table

• Activity series

What charge does the hydrogen ion have in the formula for phosphorus acid?

• 0

• +2

• -1

• +1

How many hydrogen ions are needed to balance the charge of the phosphite ion in phosphorus acid?

• One

• Two

• Three

• Four

What is the final chemical formula for phosphorus acid?

• HPO3

• H2PO3

• H3PO4

• H3PO3