Khảo sát một loại nước ngầm, người ta nhận được ph= 7,2. Độ kiềm bằng 4*10-3M. Hỏi nước ngầm này sẽ phải nằm cân bằng với áp suất riêng phần của CO2 là bao nhiêu? Biết các hằng số phân ly của axit là k1= 4*10-7, k2= 4*10-11, KH= 3*10-2 atm. M

If you want to create an electrical current, which situation would produce a solution capable of this

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *