things I have got wrong

Question 1

test for iodide ions

Answer 1

AgNO3
yellow ppt. forms

Question 2

what can you not assume in a buffer calculation unless specified

Answer 2

volume remains constant
[H+]= [A-]

Question 3

what is the Kw equation

Answer 3

Kw= [OH-][H+]

Question 4

how to test the pH of metal/non-metal oxides

Answer 4

add water then universal indicator

Question 5

sulfur trioxide with potassium hydroxide
solution equation

Answer 5

SO3 + 2KOH —-> H2O + K2SO4

Question 6

excess of magnesium oxide with
phosphoric acid equation

Answer 6

H3PO4 + MgO —> 3H2O + Mg3(PO4)2

Question 7

[Cu(H2O)6]^2+ plus ammonia eqn.

Answer 7

[Cu(H2O)6]^2+ + 4NH3 —-> [Cu(NH3)4(H2O)2]^2+ + 4H2O