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 .

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

Can someone me with 1 to 4 plz. fast

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.