Acids, pH and buffers Flashcards
1
Q
How do acids influence foods?
A
Flavour, colour, texture and microbial stability
2
Q
Acid structure
A
Proton, H+ and donor
3
Q
Base (alkali) structure
A
Proton, H+ and acceptor
4
Q
Strong acids vs weak acids
A
Strong acids (HCl) dissociates completely (H + Cl)
Weak acids partially dissociate
5
Q
How is equilibrium constant (Kc) calculated?
A
Products divided by reactants
6
Q
How is acidity measured?
A
Hydrogen ion concentration
7
Q
Equation for pH
A
pH=-log10(H+) so if pH=5 H+=10^-5
8
Q
What is the ionic constant equation?
A
(H+)(OH-)=10^-14
9
Q
What is the dissociation constant (pKa)?
A
The acidity of part of a molecule
10
Q
What is the equation for pKa?
A
pKa=-log10Ka so Ka=10^-pKa
