5. Acids, Bases and Salts Flashcards
pH of acids
Below 7
pH of neutral
7.0
pH of alkalis
Above 7
Difference between alkalis and bases
Alkalis are soluble bases
Colour chart for UI
pH 1-2 = red pH 3-4 = orange pH 5-6 = yellow pH 7 = green pH 8-9 = blue-green pH 10 = blue pH 11-14 = purple
Other indicators
Methyl orange, phenolphthalein
Colour change in phenolphthalein
Acid = colourless Alkali = pink
Colour change in methyl orange
Acid = red Alkali = orange
Formula of hydrochloric acid
HCl
Formula of nitric acid
HNO3
Formula of sulfuric acid
H2SO4
Difference between hydrogen chloride and hydrochloric acid
Hydrogen chloride is a gas - HCl(g). It has covalent bonding. When dissolved in water HCl(aq) it becomes an acid and releases H+ ions
Arrhenius definition of an acid
Substance that releases H+ ions in water
Bronsted Lowry definition of an acid
proton (H+ ion) donor
Arrhenius definition of an alkali
Substance that releases OH- ions in water