Acid + Alkali Flashcards
(29 cards)
definition of acid
substance that dissociates in water to produce hydrogen gas
does all acid contain hydrogen?
all acid contains H+ ions, but not all compounds containing hydrogen are acids
formula of hydrochloric acid
HCL
formula of sulfuric acid
H2SO4
formula of nitric acid
HNO3
what are the physical properties of acids
- sour taste
- turns blue litmus paper red
- pH smaller than 7
- conducts electricity when dissolved in water
what are the properties of alkalis
- bitter taste, soapy touch
- turns red litmus paper blue
- pH level more than 7
- conducts electricity when dissolved in water
definition of alkali
bases that are soluble in water
aqueous solution that contains hydroxide ions
difference between alkali and base
base are metal oxides & metal hydroxide
alkali contains OH- ions
(all alkali are base, but not all base are alkali)
what does acid + reactive metal give
salt + hydrogen gas
what is the test for hydrogen used?
gas EXTINGUISHES burning splint with a POP sound
what shld be observed when the test is for hydrogen gas
- effervescence observed
- colourless & odourless gas
- gas extinguishes burning splint with a pop sound
what does hydrochloric acid + magnesium produce
magnesium chloride + hydrogen gas
do all metals react with acids?
no. metals like copper, silver, gold dont react with acid
what does acid + metal carbonate produce
salt + water + carbon dioxide
what shld be observed when the test is for carbon dioxide
- effervescence observed
- colourless & odourless gas
- gas forms white precipate in limewater
what does nitric acid + sodium carbonate produce
sodium nitrate + water + carbon dioxide
what does acid + base produce
salt + water
what does acid + alkali produce
salt + water
what does sulfuric acid + calcium hydroxide
calcium sulfate + water
what does alkali + ammonium salt give
salt + water + ammonia
what does potassium hydroxide + ammonium nitrate produce
potassium nitrate + water + ammonia
what shld be observed when the test is for ammonia gas
- colourless & pungent gas
- gas turns DAMP red litmus paper blue
What does higher pH level mean
Higher pH level means it’s an alkaline, less acidic
