Acid-Base Properties of Chromium Compounds

The video explores whether chromium-3 nitrate is acidic, basic, or neutral in water. It begins by examining the neutralization reaction that forms chromium-3 nitrate, involving nitric acid and chromium-3 hydroxide. The video then discusses the strength of the acid and base, identifying nitric acid as a strong acid and chromium-3 hydroxide as a weak base. Using these insights, it concludes that the resulting solution is acidic, with a pH less than seven.

What is the main focus of the video regarding chromium-3 nitrate?

• Its color in water

• Its reaction with metals

• Its solubility in water

• Whether it is acidic, basic, or neutral in water

What are the reactants in the neutralization reaction that forms chromium-3 nitrate?

• Nitric acid and chromium-3 hydroxide

• Sulfuric acid and sodium hydroxide

• Hydrochloric acid and potassium hydroxide

• Acetic acid and magnesium hydroxide

Which of the following is identified as a strong acid in the video?

• Acetic acid

• Sulfuric acid

• Hydrochloric acid

• Nitric acid

Why is chromium-3 hydroxide considered a weak base?

• It is highly soluble in water

• It is not on the list of strong bases

• It forms a strong acid when dissolved

• It reacts violently with water

What is the role of the hydroxide group in chromium-3 hydroxide?

• It makes the compound a strong base

• It makes the compound a weak base

• It makes the compound a strong acid

• It makes the compound neutral

What is the expected pH of the solution formed by the reaction of a strong acid and a weak base?

• Greater than 7

• Exactly 7

• Less than 7

• Equal to 14

What conclusion is drawn about the nature of the chromium-3 nitrate solution in water?

• It is basic

• It is neutral

• It is acidic

• It is amphoteric

Which component in the reaction is responsible for the acidic nature of the solution?

• Chromium-3 nitrate

• Water

• Chromium-3 hydroxide

• Nitric acid

What is the significance of the pH being less than seven for the solution?

• The solution is amphoteric

• The solution is neutral

• The solution is basic

• The solution is acidic