An unknown weak acid with a concentration of 0.079 M has a pH of 1.80. What is the Ka of the weak acid

3.18x10⁻³

Explanation:

The equilibrium of a weak acid can be written as:

And Ka can be expressed as:

Keep in mind that [H⁺] = [A⁻].

We can calculate [H⁺] from the pH:

Now we compute the calculated [H⁺] (and [A⁻]) with the [HA] given by the problem:

Ka = = 3.18x10⁻³

quartz

explanation:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current