11. the ka for benzoic acid is 6.5 × 10–5. calculate the ph of a 0.10 m benzoic acid solution.

2.6

Explanation:

Benzoic acid is a weak acid that dissociates according to the following equation.

C₆H₅COOH(aq) ⇄ C₆H₅COO⁻(aq) + H⁺(aq)

We can calculate the equilibrium concentration of H⁺ using the following expression.

[H⁺] = √(Ka × Ca)

where,

Ka is the acid dissociation constant

Ca is the initial concentration of the acid

[H⁺] = √(6.5 × 10⁻⁵ × 0.10) = 2.5 × 10⁻³

The pH is

pH = -log [H⁺] = - log 2.5 × 10⁻³ = 2.6

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.