LaMotte CALCIUM AND TOTAL HARDNESS IN WATER TEST KIT - Manual (Page 2)

4. While swirling tube, add Hardness Titrant 10 (2783WT) one drop at
a time, until color changes to blue. Count the number of drops added.
Hold bottle vertically.
5. Multiply number of drops used in Step 4 as follows:
25 mL multiply by 10
10 mL multiply by 25
5 mL multiply by 50
Record the result as ppm Total Hardness as CaCO
3
.
CAL CIUM HARD NESS
1.
Rinse test tube with sample water. Fill with desired sample size selectd
from table above.
2. Add *Sodium Hydroxide with Metal Inhibitor (4259) as follows:
25mL
12 drops
10 mL 5 drops
5 mL 3 drops
3. Add one Calcium Hardness Indicator Tablet (T-5250). Swirl to mix.
Solution should be red.
4. While swirling tube, add Hardness Titrant 10 (2783WT) one drop at
a time, until color changes to blue. Count the number of drops added.
Hold bottle vertically.
5. Multiply number of drops used in Step 4 as follows:
25 mL multiply by 10
10 mL multiply by 25
5 mL multiply by 50
Record the result as ppm Calcium Hardness as CaCO
3
To determine Magnesium Hardness, subtract Calcium Hardness from Total
Hardness.
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PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
10/08