LaMotte ALKALINITY BURET TITRA TION TRAY User Manual

AL KA LIN ITY BURET TI TRA TION TRAY

1 mL = 1 mg Alkalinity as CaCO

CODE 7130

QUANTITY CONTENTS CODE

30 mL Total Alkalinity Indicator 2786-G
30 mL *Phenolphthalein Indicator, 1% *2246-G
2 x 250 mL Sulfuric Acid, 0.02N 6068-K
1 Graduated Cylinder, 50 mL, glass 0418
1 Erlenmeyer Flask, 125 mL 0431

*WARNING: Reagents marked with a * are considered hazardous substances.
Material Safety Data Sheets (MSDS) are supplied for these reagents. For your
safety, read label and accompanying MSDS before using.

To order individual reagents or test kit components, use the specified code
number.

Read the Automatic Buret Instruction Manual before proceeding.

3

PRO CE DURE

1. Fill the graduated cylinder (0418) to the 50 mL line with the sample
water. Transfer to Erlenmeyer flask (0431).

2. Add five drops of *Phenolphthalein Indicator, 1% (2246). Mix. If
solution turns red, proceed to Step 3. If solution does not turn red,
Phenolphthalein (P) Alkalinity is zero.

3. Fill the automatic buret with Sulfuric Acid, 0.02N (6068). While
gently swirling the flask, add Sulfuric Acid, 0.02N until the red color
disappears. Record buret reading as Reading P. If Total Alkalinity is to
be determined, do not refill buret, and proceed to Step 4.

4. Add five drops of Total Alkalinity Indicator (2786) to the colorless
sample from Step 3.

5. Continue titrating with Sulfuric Acid, 0.02N (6068) until the color
changes from blue-green to pink. Record buret reading as Reading T.

6. If only Total Alkalinity is being determined, follow Step 1. Add five
drops of Total Alkalinity Indicator (2786). Fill buret with Sulfuric
Acid 0.02N (6068) and titrate until color changes from blue-green to
pink. Record buret reading as Reading T.

7. Calculate test results:

Phenolphthalein (P) Alkalinity (ppm) = 20 x Reading P

Total (T) Alkalinity (ppm) = 20 x Reading T

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