Bicarbonate Ion and Chromium Chemistry

The video tutorial explains how to write the chemical formula for chromium-3 bicarbonate. It begins by identifying chromium's charge and the bicarbonate ion, which is a polyatomic ion. The tutorial emphasizes the need to balance the charges to achieve a neutral compound, resulting in the formula for chromium-3 bicarbonate. The video concludes with a summary of the steps and a thank you from Dr. B.

What is the element symbol for chromium?

• Cr

• Ch

• Cm

• Co

What charge does the chromium ion have in chromium-3 bicarbonate?

• 1+

• 2+

• 3+

• 4+

What is the chemical formula for the bicarbonate ion?

• H2CO3

• CO3 2-

• HCO3-

• HCO2-

What is another name for the bicarbonate ion?

• Carbonate ion

• Hydrogen carbonate ion

• Bicarbonate acid

• Carbonic acid

Why is chromium-3 bicarbonate considered neutral?

• Because the charges of its ions add up to zero

• Because it has no ions

• Because it is a gas

• Because it is a liquid

How many bicarbonate ions are needed to balance the charge of one chromium ion?

• Four

• One

• Two

• Three

What is the final formula for chromium-3 bicarbonate?

• Cr3(HCO3)2

• Cr2(HCO3)3

• CrCO3

• Cr(HCO3)3

What is the purpose of using parentheses in the formula for chromium-3 bicarbonate?

• To indicate the number of chromium ions

• To show the number of bicarbonate ions

• To separate the charges

• To denote a chemical reaction