Acids and alkalis Flashcards
What is formed when an acid reacts with a metal element or compound?
A salt is formed
The hydrogen atoms of the acid are replaced with atoms of the metal element.
What is neutralisation?
A reaction between an acid and a base to make a neutral solution.
What are alkalis?
Bases that are soluble in water.
What do neutralisation reactions produce?
Water and a salt.
Complete the reaction: sodium hydroxide + hydrochloric acid ➞ _______.
sodium chloride + water
What is the order of naming salts?
The name of the metal comes first.
What type of salt does hydrochloric acid produce?
Metal chlorides.
What type of salt does sulfuric acid produce?
Metal sulfates.
What type of salt does nitric acid produce?
Metal nitrates.
What are the two states of acids and alkalis?
Concentrated and dilute.
What does it mean if a solution is neutral?
It is between acid and alkaline.
What does corrosive mean?
Can cause burns if it gets on your skin.
What is an indicator?
A substance that changes color in acidic or alkaline solutions.
What does litmus paper indicate?
Whether a solution is acidic or alkaline.
What color does blue litmus paper turn in acid?
Pink.
What color does pink litmus paper turn in alkali?
Blue.
What is the pH scale used for?
To measure how acidic or alkaline something is.
What pH value indicates a neutral solution?
7.
What is the color of universal indicator at pH 0?
Red.
What is the color of universal indicator at pH 14?
Purple.
Complete the range of the pH scale: 0 to 14, with _______ indicating acidity.
Less than 7
True or False: The more concentrated the acid or alkali, the less dangerous it is.
False.
What is a universal indicator?
An indicator that shows how acidic or alkaline a solution is, changing color at each pH.
What is a base?
A compound that can react with an acid.
