Topic #9: Guide Questions

• Acids are always stored in glass containers but

  bases like NaOH solution should be stored in

  plastic container and not in a glass bottle. Why?

  • Glass is chemically resistant to acids and do not react with them.
• Acids are always stored in glass containers but

  bases like NaOH solution should be stored in

  plastic container and not in a glass bottle. Why?

  • Bases like NaOH can react with the silica in glass, leading to the weakening or etching of the glass.
• Acids are always stored in glass containers but

  bases like NaOH solution should be stored in

  plastic container and not in a glass bottle. Why?

  • Etching - process where a strong base chemically reacts with silica in glass, slowly dissolving or corroding the surface and creating a frosted or roughened appearance.
• Acids are always stored in glass containers but

  bases like NaOH solution should be stored in

  plastic container and not in a glass bottle. Why?

  • Plastic is inert to NaOH solution as they are more resistant to bases.
• Inert – not chemically reactive.
• Explain what could happen if you add water to a

  beaker containing concentrated sulfuric acid, and

  why?

  • A violent exothermic reaction can occur, causing the mixture to splash or boil rapidly, leading to burns.
• Explain what could happen if you add water to a

  beaker containing concentrated sulfuric acid, and

  why?

  • The sulfuric acid has a strong affinity for water that, when mixed, releases a large amount of heat.
• Explain what could happen if you add water to a

  beaker containing concentrated sulfuric acid, and

  why?

  • Acid to water first, not water to acid.
• Explain what could happen if you add water to a

  beaker containing concentrated sulfuric acid, and

  why?

  • When acid is slowly added first, along with constant stirring, the mixture will not splash out as the amount of generated heat is less.
• Affinity – strong attraction or tendency of one

  substance to combine with another.