Ion concentration and pH of solution

At 25 degrees C, 0.212 g of barium hydroxide is dissolved completely in sufficient water to make 0.25 liter of final solution. What is the hydrogen ion concentration (in mol/liter) in this solution? What is the pH of this solution (to the nearest integer)

determine salt mixture compostition of substance based on limiting reactant.

i have an unknown salt mixture, which was heated and the mass of the precipitate was calculated. the limiting reactant was determined, and based on this data i should be able to determine the salt mixture composition. but i have no idea where to even begin.

to find alcohol formulas

both my mum and i have looked everywhere and cannot find what i need? I have to find the alchohol formulas for; Methanol, Ethanol, Propanol, Butanol, Pentanol, Hexanol, Heptanol and Octanol. We have found chemical tables and compounds but not specifically any containing alcohol. Please can you help or tell me where i could look. Thankyou.

Pick the most exciting element in the Nitrogen column...

Pick the most exciting element in the Nitrogen column. Explain your answer.

Give the number of protons and the number of neutrons in the nucleus of the following atoms...

Give the number of protons and the number of neutrons in the nucleus of the following atoms and the number of electrons in their first and quantum shells: 10/5B 14/6C 3/2He 40/19K 16/8O