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CALCIUM CARBONATE (caco3) - DETERMINATION

TITLE-

 DETERMINATION OF CALCIUM CARBONATE (Caco3) of soil. 

Principle 

The soil is titrate  with known extended of standards hydrochloric acid to neutralize all carbonate and excess Hcl acid is back titrate with NaoH using phenolphthalein indicator .

The calcium carbonate equivalent is calculate by the volume of standard Hcl required for neutralization.

RAPID TITRATION METHOD - 

REAGENT 

  1. 0.5 N Hcl :dissolve 44.5ml Hcl in 1L of water. 

  2. 0.25 N NaoH:dissolved 10gm NaoH in 1 L of water. 

  3. Phenolphthalein indicator. 

PROCEDURE 

  1. Take 5gm soil in 250 ml conical flask. 

  2. Add 100 ml 0.5 N Hcl.

  3. Stir & keep for 1 hours. 

  4. Allow it to settle  & filter. 

  5. Take 10 ml filtrate into another conical flask. 

  6. Add 3 to 5 drops of phenolphthalein Indicators. 

  7. Titrate it against of 0.25 N NaoH still the color changes to pink. (A) note reading. 

  8. Run the blank. (B) note reading. 

OBSERVATION 

B - blank sample reading. 

A-  soil sample reading.

 FORMULA

% of CaCo3 =(B-A) × N of NaoH × 

volume of Hcl added ÷ volume of filtrate taken. 

× 100 ÷ weight of soil sample. 

× 0.05

 CALCULATION

CaCo3 % = (B-A) × 0.25 × 100/10 × 100/5 × 0.05

= (B-A) × 2.5

Hence, 

Caco3 = (B-A) × 2.5

Results 

Caco3=   __%

Rating


Rating

% caco3

Non calcareous 

Nil

Slightly calcareous 

<5

Moderately calcareous 

5.1%  to 10%

High calcareous 

10.1 % to 15%

Harmful

>15%

RESULT

According to ratings sample is -----

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