1. What is a Strength of Standard EDTA Calculator?

Definition: This calculator determines the strength of EDTA (Ethylenediaminetetraacetic acid) solution based on metal oxide weight, unknown metal volume, and its strength.

Purpose: It helps chemists and laboratory professionals standardize EDTA solutions for complexometric titrations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( [EDTA]_{zinc} \) — Strength of EDTA solution (mol/m³)
• \( w_{MO} \) — Weight of metal oxide (kg)
• \( v' \) — Volume of unknown metal (m³)
• \( S_{uk} \) — Strength of unknown metal (mol/m³)

Explanation: The formula calculates EDTA strength based on the reaction stoichiometry between EDTA and metal ions.

3. Importance of EDTA Standardization

Details: Accurate EDTA standardization ensures precise results in complexometric titrations used for water hardness testing, metal ion analysis, and other applications.

4. Using the Calculator

Tips: Enter the weight of metal oxide in kg, volume of unknown metal in m³ (default 0.05), and strength of unknown metal in mol/m³ (default 30000). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the 0.5475 factor in the formula?
A: This is a conversion factor that accounts for the molecular weight and stoichiometry of the reaction between EDTA and zinc ions.

Q2: What's a typical strength for EDTA solutions?
A: Standard EDTA solutions are often prepared at 0.01 M (10 mol/m³), but strength varies based on application.

Q3: Why use zinc for standardization?
A: Zinc provides a sharp endpoint in titrations and is stable in air, making it ideal for EDTA standardization.

Q4: How do I prepare the unknown metal solution?
A: Dissolve a known weight of high-purity metal or metal oxide in acid, then dilute to a known volume.

Q5: What indicators are used for EDTA titrations?
A: Eriochrome Black T is commonly used for zinc and other metals at pH 10.