Module 7 Electrochemical Principles Objective Two Flashcards
1
Q
quantity of hydrogen ions
A
measured by Molarity (M) in mol/L
2
Q
pH=
A
-log[H+]
remember, log scale, so a change of 1 to 2 is a change of a factor of ten
3
Q
pOH
A
a measure of the concentration of hydroxide [OH-]
4
Q
pOH=
A
14-pH
5
Q
scale
A
usually a mineral compound consisting mainly of calcium or magnesium carbonates or calcium sulphate
6
Q
Reducing pH
A
adding acids to water. acidifying water pH to below 6 cause carbonates to stay in the solution
7
Q
Reverse Osmosis
A
reduces the concentration of ions in water by about 90% by forcing water under pressure through a semi-porous membrane.
8
Q
Water Softeners
A
exchange calcium and magnesium ions for sodium ions
