1
Q
Eq. weight of CaCO3
A
50
2
Q
Eq. weight of Ca++
A
20
3
Q
Eq. weight of Mg++
A
12.2
4
Q
Eq. weight of Sr++
A
43.8
5
Q
Total Hardness definition
A
The total hardness (T.H.) of water is the sum of the carbonate hardness (C.H.) and the non-carbonate hardness (N.C.H.)
T.H. = C.H. + N.C.H.
6
Q
What is PPM?
A
PPM = parts per million
1 ppm = 1 mg per liter = mg/Liter
7
Q
Atomic weight of elements rule
A
If even (2,4) double the number. If odd (5,9) double the number plus 1.
8
Q
Exceptions to atomic weight of elements rule
A
1,4,7,17,18
for 4 & 7, swap the rules.
for 17, add 0.5
for 18, add 4
9
Q
Concentration of H+ ions in water
A
10^-7 moles/L
Water Supply Course
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