Acids And Alkalis Flashcards
(24 cards)
What are alkali metals?
Elements in Group 1 of the Periodic Table that react with water to form alkalis
They are known for their high reactivity, especially with water.
What is an acid?
A solution with a pH lower than 7 that contains hydrogen ions (H+)
Acids can be strong or weak depending on their ability to dissociate in water.
What is an alkali?
A solution with a pH greater than 7 that contains hydroxide ions (OH-)
Alkalies are typically formed from the reaction of alkali metals with water.
What is a neutral solution?
A solution with a pH of 7 that can be formed from an acid and an alkali reacting together
The reaction produces salt and water.
What is the general reaction equation for neutralization?
Acid + Alkali → Salt + Water
This equation represents the process of neutralization.
What does a universal indicator do?
Determines the pH of a solution
It changes color depending on the acidity or alkalinity of the solution.
What color does litmus paper turn in an acid?
Red
In alkali, litmus paper turns blue.
What color does phenolphthalein turn in an alkali?
Pink
In acid, phenolphthalein remains colorless.
What color does methyl orange turn in an acid?
Red
In alkali, methyl orange turns yellow.
Fill in the blank: A solution with a pH of 7 is considered _______.
neutral
True or False: Acids contain hydroxide ions (OH-).
False
Acids contain hydrogen ions (H+), while alkalis contain hydroxide ions (OH-).
Fill in the blank: A solution with a pH lower than 7 is an _______.
acid
Fill in the blank: A solution with a pH greater than 7 is an _______.
alkali
What are the two ways you can test for the pH of a substance?
Using universal indicator solution and pH paper.
What is neutralisation?
A reaction between an acid and an alkali that produces water and a salt.
What makes a solution acidic?
The presence of hydrogen ions (H+).
What makes a solution alkaline?
The presence of negatively charged hydroxide ions (OH-).
What happens when an acid and an alkali react?
A neutralisation reaction occurs, forming water and a salt.
What is formed during the neutralisation process?
Water and a salt.
Give an example of a neutralisation reaction.
HNO3 + KOH → KNO3 + H2O.
What is the net ionic equation for neutralisation?
H+ + OH- → H2O.
Fill in the blank: A neutralisation reaction occurs between an acid and an _______.
[alkali]
True or False: Hydroxide ions (OH-) are responsible for making a solution acidic.
False
What ions combine to form water in a neutralisation reaction?
Hydrogen ions (H+) and hydroxide ions (OH-).
