A0.1276 g sample of an unknown monoprotic acid was dissolved in 25.0 ml of water and titrated with 0.0633 m naoh solution. the volume of base required to bring the solution to the equivalence point was 18.4 ml. (a) calculate the molar mass of the acid. (b) after 10.0 ml of base had been added during the titration, the ph was determined to be 5.87. what is the ka of the unknown acid?

High-pressure liquid chromatography (hplc) is a method used in chemistry and biochemistry to purify chemical substances. the pressures used in this procedure range from around 500 kilopascals (500,000 pa) to about 60,000 kpa (60,000,000 pa). it is often convenient to know the pressure in torr. if an hplc procedure is running at a pressure of 1.03×108 pa , what is its running pressure in torr?