# How do you calculate pH from activity?

## How do you calculate pH from activity?

Students of chemistry are well acquainted with the relationship between solution pH and hydrogen-ion concentration:

1. pH=−log10[H+].
2. pH=−log10aH+
3. aM=γM[H+]
4. am=γmm[H+]

How do you calculate activity coefficient?

Activity coefficients may be determined experimentally by making measurements on non-ideal mixtures. Use may be made of Raoult’s law or Henry’s law to provide a value for an ideal mixture against which the experimental value may be compared to obtain the activity coefficient.

### How do you calculate concentration from activity coefficient?

The activity of a substance can be estimated from the nominal concentration of that substance (C) by using an activity coefficient, γ:

1. a=γ⋅[C]
2. lim[C]→0γ→1.
3. limγ→1a→[C]
4. logγ=−0.51z2√μ1+α√μ305.

What is the pH of 0.1 M solution of HCl?

A 0.1 molar solution of HCl has a pH = -log(0.1) = 1, a 0.01 molar solution has a pH = -log(0.01) = 2, and so forth. Hydrochloric acid is an essential component of gastric acid, which has a normal pH of 1.5 to 3.5.

## What are activity coefficient models?

The phase behavior of fluids, in equilibrium at a fixed pressure and temperature, is determined by the Gibbs free energy of the mixture. This requires a mixture model, a so-called activity coefficient model, which prescribes the variation of GE with mixture composition.

What is unit of activity coefficient?

In solutions, the activity coefficient is a measure of how much a solution differs from an ideal solution—i.e., one in which the effectiveness of each molecule is equal to its theoretical effectiveness and thus the activity coefficient would be 1.

### How is the activity coefficient of a compound calculated?

The activity coefficient is formed from calculating the ionic strength and effective ionic size. The activity coefficient can also be found from a table of known activity coefficients. The activity coefficient is used to both calculate molar solubility from K sp and to calculate pH for solutions of ionic compounds in water.

How to calculate the pH with an activity correction?

The hydrogen ion concentration is then given by [H +] = 0.1 M. Inserting it into Eq. (3) yields an approximate pH value of Now with activity correction.

## How to calculate the pH of a solution?

Use activities to calculate the pH of each of the following solutions, being sure to use $\\mathrm{\\alpha}$ values and the extended Debye-Huckel equation. The first one the concentration is $0.020 \\mathrm{M}$ $\\ce{NaCl}$ with the answer being : $\\mathrm{pH}$ = $6.99$

How to calculate the activity coefficient of LG?

Ionic Strength, activity coefficient and solubility Ions Concentration Weight [g/mole] Ca2+ mg/Lg/m3ppmeq/Lmeq/Lmol/Lmmol/L 40.1 4 Mg2+ mg/Lg/m3ppmeq/Lmeq/Lmol/Lmmol/L 24.3 4 Na+ mg/Lg/m3ppmeq/Lmeq/Lmol/Lmmol/L 23.0 1 K+ mg/Lg/m3ppmeq/Lmeq/Lmol/Lmmol/L 39.1 1