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

pla·gia·rism

/ˈplājəˌrizəm/

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noun

the practice of taking someone else's work or ideas and passing them off as one's own.

explanation:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.