the ammonia/ammonium buffer system is used to optimize polymerase chain reactions (pcr) used in dna studies. the equilibrium for this buffer can be written as nh4+(+(aq)+nh3(aq) calculate the ph of a buffer that contains 0.045 m ammonium chloride and 0.095 m ammonia. the ka of ammonium is 5.6×10? 10. express your answer using two decimal places.

Which term best describes the form sound takes as it travels away from a drum (a- gas)(b-music) ( c-waves) (d-particles

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Is a pencil falling to the floor anon contact force, a force, or a contact force