The ka of carbonic acid (h2co3) is 4.3 x 10–7. a solution of sodium hydrogen carbonate (nahco3) solution is created by dissolving 4.00 moles of sodium hydrogen carbonate in 2.00 l of aqueous solution. what is the ph of the solution at equilibrium?

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

Which change to the system wood cause the freely-moving piston to lower?

What is a difference between a mixture of elements and a mixture of compounds