Which are valid ways to make an ammonia/ammonium buffer for use in the laboratory? Mix some volume of 1 M NH 3 1 M NH3 with half as much 1 M HCl . 1 M HCl. Mix equal volumes of 1 M NH 3 1 M NH3 and 0.01 M NH + 4 . 0.01 M NH4+. Mix equal volumes of 1 M NH 3 1 M NH3 and 1 M HCl . 1 M HCl. Mix equal volumes of 1 M NH 3 1 M NH3 and 1 M NH + 4 .

Which atom or ion is the largest? 0 a. 0 0 0 0 e. li

What can be found in the ionosphere

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.