Whats the effect of acid strength on reactivity Flashcards
What is the pH scale
The pH scale, from 0 to 14, is a measure of the acidity or alkalinity of a solution, and can be measured using universal indicator or a pH probe.
A solution with pH 7 is neutral. Aqueous solutions of acids have pH values of less than 7 and aqueous solutions of alkalis have pH values greater than 7.
Wats an indicator
An indicator is a dye which changes colour depending on the ph
A wide range indicator gradually changes colour bover a road range of p.H
On a p.H probe, pH is given on a digital display as a numerical value meaning its more accurate
Why does mixing an acid and alkali cause a neutral substance
Acids form Hydrogen (H+) ions when dissolved in water
Alkalis produces hydroxide (OH-) ions when dissolved in water
H+ and OH- ions combine together to form H20 (water)
Water is a neutral substances acids and alkalis neutralise each other and form a salt and water
Thr p.H is seven and the indicator turns green showing that the neutralisation reaction is complete
Acids are also neutralised by metal carbonates to form salt, water an dcarbon dioxide
How can you tell how strong an acid is
Acid strength is based upon its tendency to form positive ions
The strength of an acid tells you about the proportion of acid particles that will comompletely ionise disassociate to release H+ ions when in aqueous solotions
Strong acis like sulfuric , nitric and hydrochloric will completely ionise in aqueous solutions and disassociate to form H+ ions
