Acids and Alkalis Flashcards
What hazards are associated with acids and alkalis?
Corrosive
Health Hazard
Extreme Health Hazard
What does corrosive mean?
Can damage body tissues e.g. skin and eyes
Name some safety precautions when using acids and alkalis
Wear googles
Do not eat or drink in the lab
Give 3 examples of acids
lemon juice, hydrochloric acid, sulphuric acid
Give 3 examples of alkalis
baking soda, washing up liquid, bleach, Sodium Hydroxide
What colours indicate an acid using universal indicator?
Red (strongest) to orange to yellow (weakest)
What colour is neutral using universal indicator?
Green
What colours indicate an alkali using universal indicator?
Blue to Purple (strongest)
What number range is acid on the pH scale?
1-6 (1 = strongest acid)
What number is neutral on the pH scale?
7
What number range is alkali on the pH scale?
8-14 (14 = strongest alkali)
Name 3 indicators
Universal indicator, Phenolphthalein, red cabbage, litmus, methyl orange
What is meant by neutralisation?
An acid reacts with an alkali to form a salt + water
Give an example of a useful neutralisation reaction
Brushing teeth with toothpaste
Indigestion tablets
Treating wasp sting with vinegar
Hydrochloric acid + Sodium Hydroxide =
Sodium Chloride + Water
Nitric Acid + Sodium Hydroxide =
Sodium Nitrate + Water
Sulfuric Acid + Sodium Hydroxide =
Sodium Sulfate + Water
Magnesium + Hydrochloric Acid
Magnesium Chloride + Hydrogen
Acid + Alkali =
Salt + Water
Metal + Acid=
Salt + Hydrogen
Metal Oxide + Acid =
Salt + Water
Sodium Oxide + Hydrochloric Acid =
Sodium Chloride + Water
Magnesium Oxide + Nitric Acid =
Magnesium Nitrate + Water
What colour does litmus turn in acid and alkali?
Acid = red, Alkali= Blue
