Chemistry - C4 Notes

Acids and their Reactions

• pH 9 = alkaline, pH 2 = acidic, pH 7 = neutral, pH 6 = acidic
• General word equation beteen an acid and a base - acid + base -> salt + water
• Universal indicator can show if an acidic solution has been neutralised
• A strong acid is one that ionises completely in water and dissociate to release H+ ions
• hydrochloric acid + sodium carbonate -> sodium chloride + water + carbon dioxide

The Reactivity Series

• Zinc is more reactive than iron
• The general word equation for when a metal reacts with an acid - acid+metal -> salt+hydrogen
• When calcium reacts with water…