Acid And Alkali Reactions Flashcards
What is the pH of acids?
Acids have a pH below 7
What colour do acids turn universal indicator?
Red, orange or yellow
What type of ions do acids form in water?
Acids form hydrogen ions (H+) in water
What does a more concentrated acid solution contain?
A more concentrated acid solution CONTAINS MORE H+ IONS
What type of bases are alkalis?
Alkalis are soluble bases
What is the pH of alkalis?
Alkalis have a pH above 7
What colour do alkalis turn universal indicator?
Blue or purple
What do alkalis form?
Alkalis form solutions containing hydroxide ions (OH -)
How do we know if an alkalis solution is more concentrated?
A more concentrated alkali solution contains more OH - ions
What can happen when alkalis react with acids?
Alkalis can NEUTRALISE acids
What is the pH range for acids?
1-6
What is the pH range for neutral?
7
What is the pH range for alkaline?
8-14
What would be the pH for a strong acid?
1
What would be the pH of a weak acid?
6
What would be the pH of a weak alkali?
8
What would be the pH of a strong alkali?
14
What are FOUR reasons why a pH probe can be better than using universal indicator?
- pH probe gives more accurate pH value
- pH probe reading is displayed digitally
- pH probe removes the need to judge colours and match them ( prevent misreading)
- pH probe gives better resolution
What is the ionic equation for the neutralisation reaction?
H+ + OH- ——> H2O
Describe what a neutralisation reaction is
The traction between an avid and an alkali which causes the H+ ions in acid and then OH- ions in alkali to come together to form water (neutral)
What is the word equation for acid alkali reactions?
Acid + alkali —-> salt + water
