QUESTION 1 2 points Save Answer Several times during the experiment work of Lab

Question

QUESTION 1 2 points Save Answer Several times during the experiment work of Lab 1 an insoluble precipitate is formed. Then in the next step a chemical reaction is performed to make the solid dissolve again. Match each reaction with a descriptive reason for the dissolution of the "insoluble" solid PbCl2(s) 4OH(a) P(OH(aq)+2 a acid-base reaction and a soluble complex ion forms CI (aq) b. soluble complex ion forms (only) c. acid-base reaction (only) GD Al(OH)3(s) +OHT(aq)Al(OH)'(aq, Fe(OH)3(s)+3 H() (aq) 3 H2o(aq) Cr(a)FeC4T d amphoteric reactant allows a soluble complex ion to form GD CaCO3(s) + 2 H+(aq) Ca2*(aq) + CO26) + H2o0 QUESTION 2 3 points Save Answer Doc Inmaking is working on his cation unknown solution, and three of the five possible cations should be present. Help Doc identify which cations are present based on his observations for the given steps Step A4 = a white precipitate forms in a yellow solution. Steps B12-13 = a red-brown precipitate forms in a colorless solution Step C22 = a dark blue precipitate forms Step D26-28 a pale pink solution results, even after centrifuging Step E30 = a white precipitate forms Step F36 = a white precipitate forms, slightly stained with grey Step G41 a colorless solution results Which cations are present in Doc's solution? Fe 3+

Explanation / Answer

1

Q1)

a) PbCl2 + 4OH- ----------> Pb(OH)4-2+2 Cl-

soluble complex ion forms (only)

option b

b) Al(OH)3 +OH- -------------> Al(OH)4-

amphoteric reactant allows to fomr soluble complex.ion

option D

c)Fe(OH)3 + 3H+ + 4Cl- ------------> FeCl4- + 3H2O

acid base reaction to form a soluble complex ion

option A

d) CaCO3 + H+ ---------------> Ca+2 + CO2 + H2O

acid- base reaction only

option c

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