Properties Flashcards
(33 cards)
properties of acids
- sour
- corrosive
what happens when acids react with metals?
acid + metal => salt + hydrogen gas
what happens when acids react with carbonates?
acid + carbonate => salt + carbon dioxide + water
what affects the pH of a solution?
the more H+ ions in a solution, the more acidic it will be and the lower the pH
how does a strong acid act in water?
a strong acid is an acid that is completely ionised in water
how does a weak acid act in water?
a weak acid is an acid that is partially ionised in water.
what does the strength of a solution indicate?
strength indicates the quantity of acid that is ionised and the terms strong and weak are used
what is a concentrated acid?
a concentrated acid is an acid having a large volume/acid in a relatively small volume of water
what is a dilute acid?
a dilute acid is an acid having a small quantity of acid in a relatively large volume of water
how can a dilute acid be a strong acid?
a dilute acid can be a strong acid if it is completely ionised in aqueous solution
how can a concentrated acid be weak?
a concentrated acid can be a weak acid if it partially ionised in aqueous solution
what does concentration indicate?
concentration indicates the quantity of acid/alkali dissolved in a litre of water and the terms concentrated and dilute are used
how are the properties of alkalis similar?
they all contain hydroxide ions (OH-)
how does the quantity of OH- ions affect a solution?
the more OH- ions in a solution, the more alkali it will be and the higher the pH.
what is the pH of acids?
0 - 7
what is the pH of alkalis?
7 - 14
what feeling to alkalis have?
a soapy feeling
alkali reactions with acids :
acid + alkali => salt + water
acid + alkali => salt + water
HCl + NaOH => NaCl + H2O
what is neutralisation?
neutralisation is the chemical reaction between an acid and an alkali to prduce a solution of a salt and water
metal + acid ?
metal + acid => salt + hydrogen
metal oxide (base) + acid ?
metal oxide + acid => salt + water
alkali + acid ?
alkali + acid => salt + water
carbonate + acid ?
carbonate + acid => salt + carbon dioxide + water
