C2F - pH & Salts Made Flashcards
(24 cards)
What colour would the UI turn when in water and why ?
Green because it’s neutral
What colour does universal indicate turn when an acid is present ?
Red
Orange
Yellow
When UI turns purple or blue what thing is present ?
Alkali
Name an acid ?
Stomach acid
Name an alkali ?
Washing up liquid
What makes the dye in UI change colour ?
The pH of a substance
What can UI be used for ?
Estimating the pH of a substance
Some indicators can show a sudden colour change. Give an example ?
Litmus turns red in acid and blue in alkali’s
How is Universal Indicator different to litmus ?
It shows a gradual colour change
If something is an acid what must it’s pH be ?
Less than 7
What ions do acids form in water ?
H+
What is the pH determined by in an acid ?
The concentration of H+ ions
What would we call something with a pH greater than 7 ?
A base
An alkali is a base that is what in water ?
Soluble
What ions do alkali’s form in water ?
OH-
What is the reaction between an acid and a base called ?
Neutralisation
What’s the word equation for neutralisation ?
Acid + Base = Salt + Water
When an acid neutralises a base. What pH will the product be and why ?
7 because it’s neutral
What are metal oxides and metal hydroxides ?
Bases
When you add an acid to a metal oxide or metal hydroxide what will it make every time ?
Salt & Water
Explain how the salts are named in a neutralisation reaction ?
The name of the acid is combined with the name of the metal oxide
What is the different product produced when we add acids and carbonates ?
Carbon dioxide
What equals water salt AND carbon dioxide ?
Acids and carbonates
Finish the equation
—- + Ammonia = ——– Salts
Acid
Ammonium
