Mangnesium is the element with that electronic configuration
Answer:
Explanation:
The best choice to prepare a buffer of pH 9.0 is a conjugate acid/base pair in which the acid has pKₐ = 9.0 ± 1.
Let's examine each of the choices.
A. NH₃/NH₄Cl
For NH₃, = pK_b = 4.75
For NH₄⁺, pKₐ 14.00 - 4.75 = 9.25
B. HCHO₂/NaCHO₂
For HCHO₂, pKₐ = 3.74
C. C₅H₅N/ C₅H₅NHCl
For C₅H₅N, = pK_b = 8.76
For C₅H₅N⁺, pKₐ 14.00 – 8.76 = 5.21
D. HNO₂/NaNO₂
For HNO₂, pKₐ = 3.33
The only acid with a pKₐ close to 9.0 is the ammonium ion.
The best buffer to prepare a buffer with pH 9.0 is
Collect the salt water and put it in something where it can boil under fire or any other heat source capable to bring the water to boiling temperature. You can consume the collected water safely , but wait for its temperature to fall, except if you need it to be hot.
The answer is D. Column chromatography has a mobile and stationary phase. The stationary phase is made of solid beads with pores of particular sizes depending on the mixture being processed. The mobile phase is usually a solvent that carries the mixture down the column as the different components of the mixtures separate. The different elements, due to differences in sizes of their molecules, pass through the pores of the beads at different rates hence elute from the columns differentially.
Ketchup is not a smoothie. Unlike smoothies, ketchup is cooked.