7 D is a green crystalline solid which dissolves in water to give a
very pale green solution. Addition of sodium hydroxide
solution to a solution of D produces a green precipitate, E,
which turns orange around the top on standing in air.
Addition of dilute hydrochloric acid and barium chloride
solution to a solution of D gives a white precipitate, F.
a) Identify D, E and F.
b) Write equations (full or ionic) for the reactions producing
E and F.

Which is true of transition metals when moving from left to right on the periodic table? the d sublevels are not filled across the period. the cation radii become larger across the period. atomic radii increase slightly and then start to decrease. atomic radii decrease slightly and then start to increase. o

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.