Topic 3 : Acids And Alkali : General Questions Flashcards
What is the colour of red cabbage indicator when placed in vinegar?
Red
Why is universal indicator a better indicator to use than litmus indicator
Universal indicator gives the pH of the solution
What colour would hydrochloric acid (PH1) turn the universal indicator
Red
What type of litmus paper is used to test for acids?
Red
Materials with a pH less than 7 are….
Acidic
Materials with a pH 7 is….
Neutral
Materials with a pH more than 7 are….
Alkalis
Washing soda is a weak alkali. What is the pH value for washing soda.
(a) 11 (b) 7 (c) 5 (d) 13
11
The value that is given to a substance to indicate how strong or weak an acid or alkali is known as the …
pH number
A pH value of 6 indicates that the substance is a weak acid. True or False.
True
A pH value of 14 indicates that the substance is a weak alkali. True or False.
False
Litmus indicator can tell you if a substance is a strong acid or a weak alkali. True or False.
False
