Flashcards
neutralisation
Cards in this deck (9)
- 1What is an acid?substances which produce H+ ions when you add them to water:
• citric acid
• sulphuric acid
• ethanoic acids - 2What is a base?substances which can neutralises acids:
• metal oxides
• metal hydroxides - 3What are alkalis?substances which produce OH- ions when you add them to water- soluble hydroxides
- 4What is a neutral substance?an substance which is neither alkaline nor acidic, ie. water
- 5What is the pH scale?shows how acidic or alkaline a solution is:
• more the 7; alkaline
• 7; neutral
• less than 7; acidic - 6Give examples of indicators• litmus; red in acids + blue in alkalis
• universal indicators; a special dye which changes colours as the pH changes
• pH meter; a glass probe attached to dip in the solution
• electronic sensor: give a digital display of the pH directly - 7What is the difference between dilute and concentrated solutions?a concentrated solution contains a greater amount of the solute in the same volume of solution than a more dilute solution
- 8What defines a strong and weak acid?strong acid: the hydrogen ions ionise completely
weak acid: only a small proportion of the molecules ionise - 9How are pH values connected to the strength of an acid (ie. the concentration of H+ ions)?as the concentration of hydrogen ions, H+ decreases by a factor of 10, the pH value increases by one unit
Information
- Description
- • 5.7: neutralisation and the pH scale • 5.8: strong and weak acids
- Created by
- Farha Idrees
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