Ionic Strength Calculator

Below-provided is the simple step by step process to calculate the ionic strength of a solution easily. Go through these rules and obtain the result.

• Check the concentration, valence of all the ions in a chemical solution.
• Get the square of the charge of every ion.
• Multiply every ion concentration with its charge square.
• Add up the products of all the species.
• Get half of the sum to know the ionic strength.

Ionic strength is the measure of the concentration of ions present in a solution. When ionic compounds are dissolved in water, it dissociates into ions. The main characteristic of the solution with the dissolved ions is the ionic strength.

The ionic strength plays an important role in Debye–Hückel theory. The concept of ionic strength was formulated by Lewis and Randall in 1921. It is based on the dissociation that involves acid, bases and salts in the presence of an aqueous solution.

The ionic strength formula computes the sum of each ion's molar concentration multiplied by the valence squared.

Ionic strength formula is I = ½ ∑_i=1ⁿ c_iz_i²

Where,

I si the ionic strength

c is the molar concentration

z is the valence

Example:

Question: Find the ionic strength of K₂SO₄.

Answer:

Given solution is K₂SO₄

Molar concentration of K⁺ = 2

Molar concentration of SO₄^-2 = 1

Valence of K⁺ = 1

Valence of O₄^-2 = 2

I = ½ ∑_i=1ⁿ c_iz_i²

Ionic strength formula is I = ½(2(1)² + 1(2)²)

= ½(2 + 4) = 3

Therefore, the ionic strength of K₂SO₄ is 3.

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1. What is the ionic strength for a 1.0 m NaCl solution?

List the concentrations and valences to reduce confusion.

Na⁺ = 1.0 M, Cl^- = 1.0 M

Ionic strength I = ½ ∑_i=1ⁿ c_iz_i²

= ½(1 * 1² + 1 * 1²) = 1

Therefore, the ionic strength of NaCl is 1.

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2. How to calculate ionic strength?

Multiply the ionic concentration with the square of ion charges. Add all the products and divide the result by 2 to get the ionic strength.

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3. What do you mean by ionic strength?

The ionic strength of a solution is defined as the measure of ion concentration in the solution. When ionic compounds are dissolved in water, it dissociates into ions. The characteristic of the solution with the dissolved ions is ionic strength.

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4. What is the ionic strength formula?

The ionic strength formula is I = ½ ∑_i=1ⁿ c_iz_i².

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