Pipe Rust – Total Iron (Fe%) Titration

Pipe Rust – Total Iron (Fe%)

Titration with standardized K₂Cr₂O₇ · Laboratory Report

Process Flow Chart

1. Dry rust

2. Weigh

3. Acid digestion

4. Filter

5. 100 mL

6. 10 mL aliquot

7. Titrate K₂Cr₂O₇

8. Calc. Fe%

Step-by-Step | चरण-दर-चरण

1. Dry rust sample

सूखा जंग का नमूना (105°C, 2h) | Dry rust at 105°C for 2 hours.

2. Weigh sample

नमूना तौलें (~1.000 g) | Weigh accurately ~1.000 g.

3. Acid digestion

HCl + HNO₃ में घोलें | Digest with HCl/HNO₃ (fume hood).

4. Filter

अविलेय को छानें | Filter insoluble residue.

5. Make 100 mL

100 mL वॉल्यूमेट्रिक फ्लास्क में भरें | Dilute to 100 mL.

6. Take 10 mL aliquot

10 mL एलिकोट लें | Pipette 10 mL aliquot.

7. Titrate with K₂Cr₂O₇

मानकीकृत K₂Cr₂O₇ से अनुमापन | Titrate with standardized dichromate.

8. Calculate Total Fe%

कुल Fe% की गणना करें | Compute total iron percentage.

Find Your K₂Cr₂O₇ Fe Factor (Standardization)

Titrate a known weight of pure iron (or certified standard) with your dichromate solution. Enter the values below to find your actual factor in mg Fe/mL.

Weight of pure Fe (mg) Pure iron or standard weight in mg

Volume of K₂Cr₂O₇ used (mL) Titre volume from standardization

Your K₂Cr₂O₇ Fe Factor:

— mg Fe/mL

Ready

► Factor = —

► Formula: Factor (mg Fe/mL) = Weight of pure Fe (mg) ÷ Volume of dichromate (mL)

Standardization procedure: Dissolve a known weight of pure iron (or certified standard) in acid, reduce to Fe²⁺, and titrate with your K₂Cr₂O₇ solution using diphenylamine indicator. The factor tells you how many mg of Fe react with 1 mL of your dichromate solution.

Auto Calculator – Total Iron (Fe%)

Sample weight W (g)

Final volume (mL)

Aliquot volume (mL)

Burette initial (mL)

Burette final (mL)

K₂Cr₂O₇ Fe factor (mg Fe/mL) Example/standardized factor – use your laboratory's actual standardization value.

Formulas & Calculation:

Titre = Final − Initial Fe mg = Titre × Fe Factor Total Fe mg = Fe mg × Final Volume / Aliquot Volume %Fe = Total Fe g / Sample Weight × 100

Master Formula (All-in-One)

% Fe = (Titre Volume × Fe Factor × Final Volume) ÷ (Aliquot Volume × Sample Weight × 10)

► Titre = —

► Fe mg = —

► Total Fe mg = —

► Total Fe g = —

► %Fe = —

Titre (mL)

—

Fe in aliquot (mg)

—

Total Fe (mg)

—

Total Fe (g)

—

— % Fe

Expected example result: 47.47% Fe

Fe% Formula: Fe% = (Total Fe g ÷ Sample Weight g) × 100

Substituted: Fe% = (— g ÷ — g) × 100

= — % Fe

Safety Alert – HCl / HNO₃ / K₂Cr₂O₇

Wear PPE: goggles, gloves, lab coat, closed shoes.
Use fume hood – acid vapours and dichromate dust are toxic.
K₂Cr₂O₇ is carcinogenic & oxidizer – avoid inhalation/contact.
Dispose hazardous waste in designated containers.

Print-friendly A4 report – use browser print.