Nitrous acid, HNO2, has a Ka of 7.1 × 10−4. What are [H3O+], [NO2−], and [OH−] in 0.51 M HNO2? [H3O+] = M [NO2−] = M [OH−] = × 10 M (Enter your answer in scientific notation.)

An aqueous solution of a strong base is pOH 1.70 at 25°C. Calculate the concentration of base in the solution if the base is NaOH. Enter your answer in the box provided. * 10 Calculate the concentration of base in the solution if the base is Ba(OH)2. Enter your answer in the box provided. x 10 M 4 M

pHpH is a logarithmic scale used to indicate the hydrogen ion concentration, [H+], of a solution: pH=−log[H+] Due to the autoionization of water, in any aqueous solution, the hydrogen ion concentration and the hydroxide ion concentration, [OH−], are related to each other by the Kw of water: Kw=[H+][OH−]=1.00×10^−14 where 1.00×10^−14 is the value at approximately 297 K. Based on this relation, the pH and pOH are also related to each other as 14.00=pH+pOH The temperature for each solution is carried out at approximately 297 K where Kw=1.00×10^−14 A. 0.20 g of hydrogen chloride (HCl) is dissolved in water to make 5.5 L of solution. What is the pH of the resulting hydrochloric acid solution? B. 0.20 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 3.0 L of solution. What is the pH of this solution? C. Calculate the concentration of HSO4− ions in a 0.010 M aqueous solution of sulfuric acid.

If [OH- ] is 2.45 x 10-10 M, what is [H3 O+ ]?