LSE 1

• What is the title of LSE 1 labster?

  Litmus Test
• The litmus test uses litmus paper to test the _ of a solution.

  acidity
• Litmus is a pH indicator that comes from _.

  lichens
• We measure acidity on a scale called _.

  pH
• _ solution contains more hydrogen ions than hydroxide ions.

  Acidic
• When the pH is less than 7, the solution is _.

  acidic
• _ solution contains less hydrogen ions than hydroxide ions.

  Basic
• When the pH is more than 7, the solution is _.

  basic
• _ solution has an equal number of hydrogen and hydroxide ions.

  Neutral
• When the pH is 7, the solution is _.

  neutral
• If the red color of the litmus paper changes to blue, then the compound is _.

  basic
• If the blue color of the litmus paper changes to red, then the compound is _.

  acidic
• If the blue color of the litmus paper remains blue, then the compound is _ or _.

  basic or neutral
• If the red color of the litmus paper remains red, then the compound is _ or _.

  acidic or neutral
• What is the pH indicator of hydrangea?

  Hydrangea flowers
• What is the pH indicator of turmeric?

  Curcumin
• What is the pH indicator of red cabbage?

  anthocyanin
• What is the pH indicator of lichens?

  Litmus
• What is the natural source of anthocyanin?


  red cabbage
• What is the natural source of curcumin?

  turmeric
• What is the natural source of hydrangea flowers?

  hydrangea
• What is the color of the basic solution of hydrangea flowers?

  pink
• What is the color of the basic solution of curcumin?

  red
• What is the color of the basic solution of anthocyanin?

  light blue
• What is the color of the basic solution of litmus?

  dark blue
• What is the color of the acidic solution of litmus?

  red
• What is the color of the acidic solution of anthocyanin?

  pink
• What is the color of the acidic solution of curcumin?

  yellow
• What is the color of the acidic solution of hydrangea flowers?

  blue
• What is the color of the neutral solution of anthocyanin?

  purple
• What is the color of the neutral solution of litmus?

  none
• Which of the pH indicators in the experiment is the only one that shows a color for it's neutral solution?

  anthocyanin
• True or False: The litmus paper should be moistened with water before dipping it into a sample.

  True
• When the litmus paper turns _, it means that a carboxylic group or phenolic group is present in the compound.

  red
• List the samples that have carboxylic acid.

  ant venom

  spinach

  lemon
• What carboxylic acid is present in ant venom?

  formic acid
• What carboxylic acid is present in spinach?

  oxalic acid
• What carboxylic acid is present in lemon?

  citric acid
• What organic compound is found in vanilla?

  vanillin
• What organic compound is found in sea snail?

  Tyrian purple