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Which is the formula for the hydronium ion?

What is the [H3O+] in a buffer that consists of 0.30 M HCOOH and 0.20 M HCOONa?  [Ka(HCOOH) = 1.7 × 10–4]

What is the conjugate base of HSO4– in the reaction below? CO32– + HSO4– HCO3– + SO42–

What is the [H3O+] in a buffer that consists of 0.30 M HCOOH and 0.20 M HCOONa?  [Ka(HCOOH) = 1.7 × 10–4]

What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2–) = 1.5 × 10–10 rev: 08_14_2014_QC_52400

What is the conjugate base of HSO4– in the reaction below? CO32– + HSO4– HCO3– + SO42–

A solution is prepared by adding 0.10 mol of sodium fluoride, NaF, to 1.00 L of water. Which statement about the solution is correct?

What is the [H3O+] for a solution at 25°C that has pOH = 5.640?

What is [OH–] for a solution at 25°C that has [H3O+] = 8.23 × 10–2 M?

In aqueous solutions at 25°C, the sum of the hydroxide ion and hydronium ion concentrations ([H3O+] + [OH –]) equals 1 × 10–14.