Calculation of ph from hydrogen ion concentration what is the ph of a solution that has an h1 concentration of (a) 1.75 3 1025 mol/l; (b) 6.50 3 10210 mol/l; (c) 1.0 3 1024 mol/l; (d) 1.50 3 1025 mol/l?

Solutions:

Case a: Finding pH for [H⁺] = 1.75 * 10⁻⁵ mol/L:

As we know pH is given as,

pH = - log [H⁺]

Putting value,

pH = - log [1.75 x 10⁻⁵]

pH = 4.75

Case b: Finding pH for [H⁺] = 6.50 * 10⁻¹⁰ mol/L:

As we know pH is given as,

pH = - log [H⁺]

Putting value,

pH = - log [6.50 * 10⁻¹⁰]

pH = 9.18

Case c: Finding pH for [H⁺] = 1.0 * 10⁻⁴ mol/L:

As we know pH is given as,

pH = - log [H⁺]

Putting value,

pH = - log [1.0 * 10⁻⁴]

pH = 4

Case d: Finding pH for [H⁺] = 1.50 * 10⁻⁵ mol/L:

As we know pH is given as,

pH = - log [H⁺]

Putting value,

pH = - log [1.50 * 10⁻⁵]

pH = 4.82