Chemistry-T8
- Created by: molly
- Created on: 01-04-18 20:21
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- Chemistry-T8
- Acids, alkalis and indicators
- Acids
- A pH less than 7.
- A source of hydrogen ions (H+), the higher the concentration of these the lower the pH.
- Alkalis
- A pH more than 7
- A source of hydroxide ions (OH-). The higher the concentration of these the higher the pH
- Indicator
- Litmus : in alkali - blue in acid - red
- Methyl orange: in alkali - yellow in acid - red
- Phenolpthaline: in alkali - pink in acid - colourless
- Acids
- Acids
- A concentrated solution contains more solute per unit volume than a dilute solution.
- If the concentration of hydrogen ions is increased by a factor of 10 the pH decreases by 1
- Strong acids molecules dissociate completely and weak acids do not dissociate completely
- Bases and Salts
- Bases are substances that neutralise acids to form a salt and water
- metal oixide + acid --> salt + water
- An alkali is a soluble base
- metal + acid --> salt + hydrogen
- metal carbonate + acid --> acid + salt + water + carbon dioxide
- acid + alkali --> salt + water
- sodium hydroxide + hydrochloric acid --> sodium chloride + water
- Bases are substances that neutralise acids to form a salt and water
- Titration
- Flash card
- Acids, alkalis and indicators
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