When making a buffer solution, a chemist would ideally choose an acid with a pKa closest to what other variable?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?