I HAVE AN EXAM TOMORROW (chemistry)

Question

1/ Write the balanced net ionic equation for a solution formed from AgNO_{3 (aq)}  and K₂S_(aq)

_2/Write the balanced net ionic equation for a solution formed from CaCl_2(aq) and Na₂SO_4 (aq)

_3/Write the balanced net ionic equation for a solution formed from CuCl_2 (aq) and Li₃PO_{4 (aq)}

Answer 1

first, the questions are not worded correctly. it is not just a solution alone that is formed during these reactions. a precipitate is also formed in each case. so, the first question should say: write the balanced net ionic equation for the reaction when AgNO3 (aq) and K2S (aq) are mixed together. similarly for the other two

i will show you how to do the first. attempt the other two in a similar manner

AgNO3 (aq) --> Ag⁺ (aq) + NO₃^- (aq)

K2S (aq) --> 2 K⁺ (aq) + S^2- (aq)

when the two solutions are mixed and when Ag⁺ and S^2- meet, they form the precipitate Ag2S as it is insoluble in water. the other product KNO3 stays in solution as the ions as it is soluble in water. thus,

2 Ag⁺ (aq) + 2 NO₃^- (aq) + 2 K⁺ (aq) + S^2- (aq) --> Ag2S (s) + 2 K⁺ (aq) + 2 NO₃^- (aq)

canceling the spectator ions, K⁺ and NO₃^- on both sides of the arrow,

the net ionic equation is:

2 Ag⁺ (aq) + S^2- (aq) --> Ag2S (s)

try the other two the same way knowing that CaSO4 and Cu3(PO4)2 will get precipitated as solids

all the best on your exam tomorrow

K2S (aq) -->