Taylor K-1531

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DROP TEST CAUSTIC SODA (SODIUM HYDROXIDE, 1 drop = 0.1% or 1%)

COMPONENTS: 1 x 4029 Pipet, Calibrated 0.5 & 1.0 mL, plastic 1 x 5087 Instruction 1 x 9198G Sample Tube, Graduated, 25 mL, plastic w/cap and green dot 1 x R-0638G-C Phenolphthalein Indicator (green cap), 2 oz, DB 1 x R-0691-C Sulfuric Acid Reagent, 2 oz, DB.

For 1 drop = 0.1% Sodium Hydroxide

1. Rinse and fill 25 mL sample tube (#9198G) to 10 mL mark with water to be tested.
2. Add 2 drops R-0638G Phenolphthalein Indicator. Swirl to mix. Sample should turn red.
3. Add R-0691 Sulfuric Acid Reagent dropwise, swirling and counting after each drop, until color just changes from red to colorless. Always hold bottle in vertical position.
4. Multiply drops of R-0691 Sulfuric Acid Reagent by 0.1. Record as grams per 100 mL (g/100 mL) caustic soda (sodium hydroxide).

NOTE: At low levels, grams per 100 mL can be regarded as percent, but not at higher levels due to the increase in density of the solution.

For 1 drop = 1% Sodium Hydroxide

1. Using a 1.0 mL pipet (#4029), add 1.0 mL water to be tested to clean 25 mL sample tube (#9198G). Dilute to 10 mL with tap water.
2. Add 2 drops R-0638G Phenolphthalein Indicator. Swirl to mix. Sample should turn red.
3. Add R-0691 Sulfuric Acid Reagent dropwise, swirling and counting after each drop, until color just changes from red to colorless. Always hold bottle in vertical position.
4. Record drops of R-0691 Sulfuric Acid Reagent as grams per 100 mL (g/100 mL) caustic soda (sodium hydroxide).