12 mystery test tubes

Question 1

K2CrO4 + AgNO3

Answer 1

yellow +clear= dark red , 2Ag+(aq) + CrO42-(aq)–> Ag2CrO4(s)

Question 2

K2CrO4 + Pb(NO3)2

Answer 2

yellow+clear=bright yellow/white. Pb2+(aq) + CrO42-(aq) –> PbCrO4(s)

Question 3

K2CrO4 + Fe2(SO4)3

Answer 3

yellow+red=orange powder that dissolves. 2Fe3+(aq) + 2CrO42-(aq) –> Fe2(CrO4)3(s)

Question 4

Fe2(SO4)3 + Na2CO3

Answer 4

red+clear=brown/orange powder. 2Fe3+(aq) + 3CO32-(aq) –> Fe2(CO3)3(s)

Question 5

Fe2(SO4)3 + NaOH

Answer 5

red+clear =mud/dark brown. Fe3+(aq) + 3OH-(aq) –> Fe(OH)3(s)

Question 6

NH3 + AlCl3

Answer 6

smell(identified)+clear=clear, wispy clouds, resembles ice. Al3+(aq) + 3OH-(aq) –> Al(OH)3(s)

Question 7

CuSO4 + NH3

Answer 7

blue + smell=dark blue. Cu2+(aq) + 2OH-(aq) –> Cu(OH)2(s)

Question 8

AgNO3 + HCl

Answer 8

clear(already identified)+clear=pale white ppt. Ag+(aq) + Cl-(aq) –> AgCl(s)

Question 9

NaOH + NiCl2

Answer 9

clear(already identified)+green=light blue/green gel. Ni2+(aq) + 2OH-(aq) –> Ni(OH)(s)

Question 10

CuSO4 + Pb(NO3)2

Answer 10

blue +clear(already identified)=white, wispy. SO42-(aq) + Pb2+(aq) –> PbSO4(s)

Question 11

AgNO3 + NaC2H3O2

Answer 11

clear(already identified)+clear=clear, barely visible particles. Ag+(aq) + C2H3O2-(aq) –> AgC2H3O2(s)

Question 12

HCl +N2CO3

Answer 12

clear+ clear (both identified)=bubbles. 2H+(aq) + CO3-(aq) –> H2O(l) + CO2(g)