Acids And Alkalis Flashcards
What colour does litmus turn in acid?
Red (pink).
What are the indicators used for in science
To show which things are acids and which are alkalis
What can you use to crush a plant to get its colour out?
A mortar and pestle.
Why is universal indicator often more useful than other indicators?
Because it can tell you how strong or weak and acid or alkali is.
What is the PH of a neutral solution?
7
Sodium hydroxide has a PH of 14. What does this tell you about sodium hydroxide?
It tells you that it is a strong alkali
What is the pH of a strongly acidic solution?
1
How does acid affect limestone?
It reacts (fizzes) wearing away (dissolving) the rock.
What is the missing word?
acid + ……… = neutral solution
Alkali
What causes in digestion?
Too much acid in the stomach.
How do indigestion tablets work?
They neutralise the excess acid in my stomach.
Why is toothpaste usually slightly alkaline?
So that it can neutralise the acids that cause tooth decay.
How can farmers change the PH of acidic soil?
By adding lime (alkali).
How would you test the pH of some soil?
By adding distilled water, shake the soil and water, filter, then add to universal indicator to the colourless filtrate
