Question

will not precipitate in the presence of limited (or excess) base or ammonia. Therefore, KOH is not amphoteric and does not form an ammonia complex. Prelab forms a precipitate in the presence of limited NaOH and ammonia. This precipitate n the presence of excess ammonia but NOT in the presence of excess NaOH a. Is Cd'2 amphoteric and/or does it form an ammonia complex? b. Write the equation for the reaction of Cd (aq) with limited OH c. Write the equation for the reaction of the above product with excess NHs(aq). HINT: Cd'2 forms the soluble ammonia complex Cd(NHso 2 2. Pb2 forms a precipitate in the presence of limited NaOH and ammonia. This precipitate dissolves in the of excess NaOH but NOT in the presence of excess NH3. a. Is Pb"2 amphoteric and/or does it form an ammonia complex? b. Write the equation for the reaction of Pb (aq) with limited OH c. Write the equation for the reaction of the above product with excess OH. HINT: Pb2 forms the soluble hydroxy complex Pb(OH)42 3. Bi forms a precipitate in the presence of limited NaOH and ammonia. This precipitate does not dissolve in either excess NaOH or NHs. a. Is Bi amphoteric and/or does it form an ammonia complex? b. Write the equation for the reaction of Bi (aq) with limited OH. 54

Answer 1

21 hom s plen e s 3rth Ammonia, sometines "These a九e Called AmPm {no Com pl en Nao μ Poduces a precipitate of. dCotAouch dissolves în encess N3 (o)eacts with encess aueou s NH3 to Precipitate a2 aj p62st İs Amphatesuc. It an geact either as abase as an acid. Tk ms omplen oh ammonia encess oH soluble eheo mplen fs added to Pb

L s Bị 3-F 3-t yCa2 3-t a2
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