What is present in solution Barney is carrying an open container containing 0.05 moles of solid sodium acetate across the lab, but he trips and spills the contents of the container into a beaker containing 1.0 L of 0.1 M acetic acid solution (at 298 K). Assuming that the addition of sodium acetate does not change the volume of the solution, what is the final concentration of protons in the mixture

Can someone me with questions 12 and 13 plz.

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?