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Questions and Answers List

Question	Answer
What is a precipitate?	An insoluble salt formed when solutions are mixed together
Which ions do acids release in solution?	Hydrogen ions (H+)
Which ions do alkalis release in solution?	Hydroxide ions (OH-)
What is the pH of an acidic solution?	0-6
What is the pH of an alkaline solution?	8-14
An acid with a pH of 3 is diluted by a factor of 10. What is the new pH?	4
Predict the colour of the Universal Indicator in a strong alkaline solution?	Dark blue or purple
What colour does a litmus turn in alkali?	Blue
What colour change happens in phenolphthalein as it goes from acidic to alkaline?	Colourless to pink
What colour is methyl orange in acid?	Red
How is a concentrated acid different to a dilute acid?	More acid is dissolved per dm^3
Describe a strong acid?	An acid that completely dissociates in solution
Give an example of a strong acid?	Hydrochloric Acid
What is the formula of sulfuric acid?	H2SO4 (Both numbers of bottom)
Describe a weak acid?	An acid that partially dissociates in solution
What is an alkali?	A base which is soluble in water
Which products form when an acid reacts with a metal?	Salt + Hydrogen
Which products form when an acid reacts with a metal oxide or hydroxide?	Salt + Water
Which products form when an acid reacts with a metal carbonate?	Salt + Water + Carbon Dioxide
Name a type of salt which is always soluble?	Sodium
What is a precipitate?	An insoluble salt formed when solutions are mixed together