Question

The hydrogen ion concentration of a buffer solution consisting of a weak acid and its salts is given by ____________.

विकल्प

• `["H"^+] = "K"_"a"(["acid"])/(["salt"])`

• [H⁺] = K_a [salt]

• [H⁺] = K_a [acid]

• `["H"^+] = "K"_"a"(["salt"])/(["acid"])`

Answer 1

The hydrogen ion concentration of a buffer solution consisting of a weak acid and its salts is given by `underline(["H"^+] = "K"_"a"(["acid"])/(["salt"]))`.

Explanation:

According to Henderson equation

pH = `"pK"_"a" + log  (["salt"])/(["acid"])`

i.e., −log [H⁺] = `-log "K"_"a" + log  (["salt"])/(["acid"])`

−log [H⁺] = `log  (["salt"])/(["acid"]) xx 1/("K"_"a")`

`log  1/(["H"^+]) = log  (["salt"])/(["acid"]) xx 1/("K"_"a")`

∴ [H⁺] = `"K"_"a"(["acid"])/(["salt"])`