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The data
that you see here represents the water hardness that other students have
measured in the past. |
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Use this
data as a starting point for your tap water dilutions. Your measured water hardness may vary from
this |
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data
substantially. The substantial
standard deviations do not represent measurement error. They represent |
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the wide
range of concentrations encountered in different samples. Ave = average; SD = standard deviation |
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Mg |
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Ca |
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Number of
Samples |
Water
Hardness |
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Ave (ppm) |
SD (ppm) |
Ave (ppm) |
SD (ppm) |
Mg |
Ca |
ppm CaCO3 |
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Davis |
40 |
40 |
20 |
10 |
4 |
3 |
222 |
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Sac
Region |
8 |
7 |
20 |
30 |
49 |
63 |
71 |
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Surrounding
Region |
30 |
40 |
40 |
90 |
18 |
13 |
221 |
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Near
CSUS/So. Side |
3 |
2 |
8 |
2 |
6 |
12 |
30 |
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Near
CSUS/No. Side |
13 |
5 |
30 |
70 |
12 |
13 |
132 |
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South
Sacramento |
7 |
9 |
6 |
3 |
10 |
11 |
45 |
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NE region |
4 |
7 |
10 |
10 |
11 |
15 |
43 |
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Rancho
Cordova |
6 |
2 |
9 |
3 |
5 |
6 |
45 |
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