Flashcards in C2f Deck (12):
How can universal indicator be used to estimate the pH of a solution?
It changes colour.
What are the colour changes with litmus?
Red = acid
Blue = alkali
What do indicators use colour changes to show?
Sudden or gradual changes in pH.
colour changes over different pH ranges.
What is an alkali?
A soluble base.
What is the word equation for neutralisation?
acid + base = salt + water
What do all acids in solution contain?
What is the pH of an acid determined by?
The concentration of H+ ions.
Why is an acid neutralised by an alkali?
acids contains H+ ions.
alkalis contains OH- ions
neutralisation involves the reaction H+ + OH- = H2O
What can an acid be neutralised by?
An alkali or base.
Why do metal oxides and metal hydroxides neutralise acids?
Some dissolve in water. These soluble compounds are alkalis. even bases that won't dissolve in water will still react with acids. So, all metal oxides and hydroxides react with acids to form a salt and water because they are bases.
What do carbonates neutralise?
Acids, to give water, a salt and carbon dioxide.