pH And Indicators Flashcards
What is pH?
2
-log(base 10) [H+]
Where the square brackets indicate concentration in moles per litre
What is the pH of a solution?
The negative logarithm to the base 10 of the hydrogen ion concentration measured in moles per litre
What is the pH of an acidic solution?
Less than 7
What is the pH of the basic (alkaline) solution?
Greater than 7
What is the pH of a neutral solution?
Equal to seven
What is a strong acid?
A good proton donor
What is a weak acid?
A poor proton donor
What is the acid dissociation constant, Ka, defined as?
[H+][A-] divided by [HA]
What is a strong base?
A good proton acceptor
What is a weak base?
A poor proton acceptor
What type of conjugate base does a strong acid have?
A weak conjugate acid
What type of conjugate base does a weak acid have?
A strong conjugate base
What does pH + pOH equal?
14
What is pOH?
-log(base 10)[OH-]
What does [H+] equal?
2
Square root of Ka x M acid
Where M acid is the concentration of the acid in moles per litre
What does [OH-] equal?
2
The square root of Kb x M base
Where M base is the concentration of the base in moles per litre
What is an acid base indicator?
An acid-base indicator is a substance that changes colour according to the pH of the solution in which it is placed
What is the range of an indicator?
The range of an indicator is the pH interval over which there is a clear change of colour for that indicator
