A solution made from pure barium hydroxide contained 2.74g in exactly 100cm3 of water. Using phenolphthalein indicator, titration of 20.0cm3 of this solution required 18.7cm3 of a hydrochloric acid solution for complete neutralisation.(Atomic masses: Ba =137, O=16,H=1). (a) Write the equation for the titration reaction. (b) Calculate the concentration of the barium hydroxide solution. (c) Calculate the moles of barium hydroxide neutralised.(d) Calculate the moles of hydrochloric acid neutralised. (e) Calculate the concentration of the hydrochloric acid.

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

Name 3 types of energy you see being used as you look around a classroom