Oxidation Numbers in Sodium Thiosulfate

This video tutorial explains how to determine the oxidation numbers for sodium thiosulfate (Na2S2O3). It begins by calculating the average oxidation number for sulfur in the compound, considering it as a neutral compound where all oxidation numbers sum to zero. The video then delves into the specific oxidation numbers for each sulfur atom, highlighting the differences due to their bonding with oxygen. A comparison with the sulfate ion (SO4 2-) is made to further clarify the oxidation states. The tutorial concludes with a summary of the oxidation numbers for Na2S2O3.

What is the primary goal of the video regarding sodium thiosulfate?

• To find the molecular weight

• To determine the average oxidation number of sulfur

• To analyze the color change

• To calculate the boiling point

Why do all oxidation numbers in sodium thiosulfate add up to zero?

• Because it is an ionic compound

• Because it is a neutral compound

• Because it is a polar compound

• Because it is a covalent compound

What is the oxidation number of sodium in sodium thiosulfate?

• -1

• 0

• +2

• +1

How is the average oxidation number of sulfur in sodium thiosulfate calculated?

• By measuring the compound's pH

• By assuming sulfur is always +6

• By using the compound's melting point

• By using the known oxidation numbers of sodium and oxygen

What is the oxidation number of oxygen in sodium thiosulfate?

• -1

• -2

• 0

• +1

Why do the sulfur atoms in sodium thiosulfate have different oxidation numbers?

• Because they are isotopes

• Because they are bonded to different elements

• Because they are in different phases

• Because they have different atomic masses

What is the oxidation number of sulfur in the sulfate ion?

• +4

• +6

• 0

• +2

How does the sulfate ion help in understanding the oxidation numbers in thiosulfate?

• By being a different phase

• By having the same molecular weight

• By having the same color

• By providing a similar structure

What is the specific oxidation number of the sulfur bonded to three oxygens in thiosulfate?

• -2

• +4

• 0

• +6

What is the specific oxidation number of the sulfur bonded to another sulfur in thiosulfate?

• +2

• -2

• +6

• 0